Monday, February 28, 2011

Igneous Rocks

Read the following link.
Tell me about Igneous rocks.  Where do they come from, what does igneous mean, what types are there, what are some examples and where do we find them?

Report your findings!

Igneous Rocks

138 comments:

Rembold,Abby said...

Igneous rocks comes from hot fluid material. It is Latin for fire. An example of igneous is extrusive another type of rock is intrusive. We find them where lithospheric plates pull apart at mid ocean ridges.

Andrew Gibbous McCarthy said...

Igneous rocks form in three places where lithospheric plates pull apart at ocean ridges. Where plates come together at subduction places and where continental crust are pushed together.

Igneous comes from the latin word fire.

Luke said...

Igneous rocks come from the latin word "fire". Igneous rocks are formed when lave cools either on the surface (extrusive) or in pockets of magma inside the earth (intrusive). Some examples are feldspar, quartz, amphiboles and pyroxenes

Anonymous said...

"igneous" comes from the Latin for fire. This material may have been lava erupted at the Earth's surface, or magma. An example of igneouse is exstrusive and intrusive. We see these examples when lithospheric plates pull apart at a mid ocean ridges.

Anonymous said...

@abby! Wow! I thinks it's cool that igneouse rocks come fron a hot fluid material! I wonder what color the hot material is? Do you know?

Gerdes,Austin said...

Igneous rocks begin as hot fluid material and the word "igneous" comes from the Latin for fire. This material may have been lava erupted at the Earth's surface, or magma.

Rembold,Abby said...

@anna
i have no idea what color it could be. it would be cool to find out though.

Gerdes,Austin said...

@abby

imagine that.. another word with latin herratige

Luke said...

@ andrew,
you forget that igneous can form in deeppockets of magma, it doesn't just have o be extrusive.

Henson,Megan said...

Igneous rocks begin as hot, fluid material."Igneous" comes from the Latin for fire. An example of igneouse is exstrusive and intrusive. We find them where lithospheric platers pull apart at mid ocean ridges.

Henson,Megan said...

@ Anna:
I agree, it is cool that it comes from hot material. I wonder how hot it really is.

Schirmer,Brandon said...

Igneous rocks begin as hot, fluid material, and the word "igneous" comes the Latin for fire.Rock formed of lava is called extrusive, rock from shallow magma is called intrusive and rock from deep magma is called plutonic. The deep sea fllor is where you can find some igneous rocks.

Kresser Jacob said...

Ignous rocks come from lava or magma. Igneous comes from the latin word for fire. It either froms from cooled lava on the outside called extrusive or on the inside when magma is cooled intrusive

Anonymous said...

@abby It would be a scientific discovery! (scientist probably alrady know the color) I alxo wonder why it has to be hot! couldnt it be cold?

Moehring,DeeAnna said...
This comment has been removed by the author.
schatzman.arin said...

Igneous means "fire" in latin.Igneous comes from hot fluid materials.We find them where lithosphereic plates pull at mid-ocean ridges.Examples of ingneous rocks are extrusive and intrusive.

LaGrangeBonnie said...

Igneous comes from the latin word for fire.Igenous rocks form where lithospheric plates pull apart at mid-ocean ridges, where they come together at subduction zones, and when they push together at continental plates. Three types of igneous rocks are intrusive rocks, extrusive rocks,and plutonic rocks. Intrusive rocks are rocks formed in shallow magma. An example of intrusive rock could be Basalt but Basalt could also be extrusive. Extrusive are formed of lava. Examples of extrusive rocks are obsidian and pumice. Plutonic rocks are formed in deep magma.

LaGrangeBonnie said...

@ Anna I think if it was cold it would form a different kind of rock not igneous, but I'm not sure.

Moehring,DeeAnna said...

Igneous is latin for fire. It comes from a hot fluid material.
Examples of igneous rock are exstrusive and intrusive. We find them where lithospheric plates pull apart at mid ocean ridges.

schatzman.arin said...

2 drew

Why don't you post where the 3 places they come from are since you said that they come from 3 places.

Schirmer,Brandon said...

@ luke

how many igneous rocks do you think are there.

Peters,Jennifer said...

The word igneous comes from the LAtin term "fire". igneous rocks can be intrusive and extrusive. Examples of this type of rock are basalt and granite(most common type). We can find these rocks in three main places. Such as: where lithospheric plates pull apart at mid-ocean ridges, where plates come together at subduction zones, and lastly where continental crust is pushed together.

Moehring,DeeAnna said...

@anna sanzere
i didnt know that the material of igneous rocks may be erupted lava at the earths surface.!

Peters,Jennifer said...

The word igneous comes from the LAtin term "fire". igneous rocks can be intrusive and extrusive. Examples of this type of rock are basalt and granite(most common type). We can find these rocks in three main places. Such as: where lithospheric plates pull apart at mid-ocean ridges, where plates come together at subduction zones, and lastly where continental crust is pushed together.

ReddingtonDavid said...

igneous rocks are latin and come from the word fire. Basalt is both intrusive and extrusive. Graniteis extrusive

Sturwold, Kaylee said...

Igneous rocks; Igneous comes from the latin word fire. It is the first great class. This mineral may have been lava that erupted at the earths surface or magma. They form at three main places. Where lithsospheric plates pull apart at mid ocean ridges. Where plates come together at subduction zones. And where continental crust is pushed together. Pumice is a gas charged igneous rock. Basalt from the crust of an old lava flow. Granite from pikes peak, colorado.

Peters,Jennifer said...

@Bonnie
I didn't know that was another type of rock. I mean plutonic anyway. That's very interesting:)

Anonymous said...
This comment has been removed by the author.
Andrew Gibbous McCarthy said...

@ arin

i did read it again

ReddingtonDavid said...

@ jenn
i thought granite was intrusive

Anonymous said...

Igneous means fire.

Igneous rocks are formed in three main places,where lithosphritc plates pull apart at the mid-ocean ridge ,where plates come together at subduction zone and where continental crust is pushed together

The types of Igneous rocks are extrusive,intrusive,and plutonic
Sarah Savard

kallmeyer, bridget said...

Igneous rocks come from magma melting and cooling.

Igneous means "fire."

To types of Igneous rocks are intrusive and exrusive.

To examples are Granit and Basalt. You can find Granit beneath the eaths surface. you can find Basalt on the earths surface.

Sturwold, Kaylee said...

@bonnie thats cool that basalt is an intrusive rock and extrusive rock.

Anonymous said...

There are many catorgies that rocks fall into and they are very easy to tell apart. Igneous rocks begin as hot, fluid material, and the word "igneous" comes from the Latin for fire. Igneous rocks form in three main places: where lithospheric plates pull apart at mid-ocean ridges, where plates come together at subduction zones and where continental crust is pushed together, making it thicker and allowing it to heat to melting.
Examples are gabbro and basalt

Lamping Ally said...

Igneous comes from the latin word fire. Igneous begins as a hot fluid liquid. Examples are basalt and granite.

Anonymous said...

@ Abby
You find sedimentry & this in the ocean too?? Wow, I didn't know that.

Lamping Ally said...

@ jenn (:
I didnt know igneous rocks were intrusive rocks!

Andrew Gibbous McCarthy said...

@ anna

i didnt know it could be formed by erupted lava

Savard, Samantha said...

Igneous rocks come from hot fluid material which might have been lava. Igneous comes from the latin word "fire". The types of Igneous rocks are intrusive and extrusive. An example of Igneous rocks are basalt and rhyolite.

Mauricio,Courtney said...

Igneous rocks comes from under the earth. Its latin for FIRE
Example is extrusive and intrusive
Where to find: Lithopshereic plates pull apart(Mid-Ocean Ridges)

Anonymous said...

@kalley
I got the same thing as you
Sarah Savard

Garvey, Emily said...

Igneous comes from the latin word fire. Igneous begins as a hot fluid liquid. Examples are basalt and granite.(:

Anonymous said...
This comment has been removed by the author.
bader,lindsay said...

igneous rocks come from fluid materials that is hot. it in latin for fire. the examples of igneous rocks are extrusive and intrusive. you can find igneous rocks in plates pulled apart at mid ocean ridges

Anonymous said...

volcanoes,fire, what types are there, near volcanoes either in the ground or on the ground.

Michael Twilling

bader,lindsay said...

luke i never new that igneous rocks come from latin word fire.

Tedesco.Jake said...

Igneous rocks begin as hot fluid material and the word "igneous" comes from the Latin for fire.igneous rocks come whem lava cools and hardens.Some examples are feldspar, quartz, amphiboles and pyroxenes.

Tedesco.Jake said...

@jenn
I didnt know igneous rocks were intrusive rocks.

Alana Gulley said...

Igneous rocks are made from hot magma. Igneous is latin for fire. The most common way of forming an igneous rock is when a volcanoe erupts, and when it is under pressure under things such as more magma and volcanic ash and volcanic rock, the magma cools and forms the ignepous rock.(:
~* Alana Gulley *~ (: <3

bekah said...

ingeous rocks are born hot. some examples are extusive and intrusive. you can find them where lithospheric plates pull apart at mid ocean ridges.

Julia Greve said...

igneous rock is rock that formed from the cooling of lava. the most common igneous types are basalt and granite. the name igneous comes from the latin word for fire.

Smith,Courtney said...

"Igneous" comes from the latin word "fire".Igenous rocks form where lithospheric plates pull away from each other at mid-ocean ridges, when they come together at subduction zones, also when they push together at continental plates. examples of this rock are basalt and granite.igneous rocks can be intrusive and extrusive.Intrusive rocks are rocks formed in shallow magma.Extrusive are formed of lava. Plutonic rocks are formed in deep magma.

Julia Greve said...

@ sanzere
probably red like the magma that is also there

hutson,cody said...

They are born hot.They come from the lava. The types are extrusive intrusive and plutonic.We find them on the earths surface.

Riley, Olivia said...

Igneous means fire. Igneous rocks come from the hot melted material under the earth's crust. They form in places where lithospheric plates pull apart from eachother at ocean ridges, subduction plates, and where continental crust is puhed together.

hutson,cody said...

@REmbold,Abby

I forgot to add that its latin for fire.

Smith,Courtney said...

@ bonnie


I think tis is interesting and i really didn't know until now there was another type like Plutonic

Smith,Courtney said...

@ bonnie


I think tis is interesting and i really didn't know until now there was another type like Plutonic

Sydney,Vest said...

Rocks fall into three great categories, and there pretty simple to tell apart. you can tell through the rock's texture or any other properties. Igneous rocks come from hot fluid material. An example of this is Extriutive and Intrusive. We find these rocks around ocence mid ridges.

brendanmarchetti said...

igneous rocks come from hot fliuds an example of this is intrusive igneous means fire it is found at the bottom of the ocean

Sydney,Vest said...

i have no idea anna!! i didnt know that but i woukld like to know

Henry Minning said...

Igneous means fire. Igneous rocks are formed when lava cools. It also comes from hot fluid materials. Types are intrusive and extrusive. An example of this rock is granite.

@ andrew

Cool. I didnt't catch the part about were the form, like the lithosphere.

Alec said...

igneous means fire. they are formed when lava cools and hardens. an example of it is feldspar and quartz

Anonymous said...

Igneous comes from the latin word for fire.Igenous rocks form where lithospheric plates pull apart at mid-ocean ridges, where they come together at subduction zones, and when they push together at continental plates.

Austin breiner

baxter bryan said...

An example of igneous is extrusive another type of rock is intrusive. We find them where lithospheric plates pull apart at mid ocean ridges.Igneous rocks come from the latin word

baxter bryan said...

abby rembold-ya i think the igneous rock comes from hot fluid and it is latin fire.

Natalie said...

Igneous rocks begin as a hot fluid material. The word igneous means fire. There are extursive rocks, intrusive rocks and plutonic rocks. Some examples of igneous rocks are pumice and obsidian.Igneous rocks form in three main places: where lithospheric plates pull apart at mid-ocean ridges, where plates come together at subduction zones and where continental crust is pushed together.

Natalie said...

@ Bonnie

How can a rock be extrusive and intrusive? I thought they were two separate things.

Andie said...

Igneous rocks come from: Where lithospheric plates pull apart at mid-ocean ridges, where plates come together at subduction zones and where continental crust id pushed together. Igneous is Latin for fire. EX: basalt and granite. Find them

Andie said...

@Natalie
WHat are some examples of plutonic rocks?

Natalie said...

@ Kailey

That's cool that granite comes from pikes peak colorado. I always thought that it came from somewhere cold.

johnson, allison said...

it comes from hot fluid materials and is latin for "fire". there is 2 types of igneous rocks: extrusive and instrusive. we see them when lithospheric plates pull apart at mid ocean ridges.

John Dinger said...

igneous rocks come from hot fluid magma. igneous means "fire" in latin. there are extrusive,intrusive and plutonic.
they are found at mid ocean ridges, subduction zones and where continental crust is being pushed together. some examples are obsidian and pumice

@lukee namie
do you know if igneous rocks are higher or lower or all around on the mohs hardness scale? if you do know, let me know

walter burkart said...

igneus means fire itcomes from volcanos begins as hot melted rock then cools to a hard solid form there is extrusive and intrusive basalt is an example

johnson, allison said...

@LaGrangeBonni that is cool how basalt could be both extrusive and instrusive. i never thought of that.

wukusick,anna said...

Igneous start out as hot, fluid material. The word for igneous comes from the latin word for fire. Igneous frocks are made out of lava or magma. Igneous rocks come from where lithospheric plates pull apart at mid-ocean ridges, where plates come together at subduction zones and where continental crust is pushed together, making it thicker and allowing it to heat to melting.

Zach "Hillshire" Viox said...

Where do they come from:Igneous rocks begin as hot, fluid material.This material may have been lava erupted at the Earth's surface, or magma at shallow depths, or magma in deep bodies.

what does igneous mean:Fire in latin

what types are there:Although there are others the 2 main types are basalt and granite.

what are some examples and where do we find them:Felsite (and/or) Rhyolite is the light-colored intrusive or extrusive felsic rock. The shallow version of granite.

Anonymous said...

Igneous rocks comes from hot fluid material. It is Latin for fire. An example of igneous is extrusive another type of rock is intrusive. We find them where lithospheric plates pull apart at mid ocean ridges.

by monni szary

walter burkart said...

to abby rembold by types of rocks i think mrs.hoffman wanted acully rocks like granite and basalt

alyssa weber said...

ALYSSA AND KYLE
-the come from hot fluid material
-igneos means "fire"
-some types of igneous rock are intrusive and extrusive.
-some examples are Basalt, Granite
-we find them on the deep sea floor

walter burkart said...

to anna sanzere you forgot about the examples like granite and basalt

Zach "Hillshire" Viox said...

@John Dinger
That is a good question. I wonder how high and low some of these rocks are on the Moh's hardness scale.

kylie Gill said...

Igneous rocks comes from hot fluid material. It is Latin for fire. An example of igneous is extrusive another type of rock is intrusive. We find them where lithospheric plates pull apart at mid ocean ridges.

wukusick,anna said...

@ andie
what do you mean by find them???

alyssa weber said...

ALYSSA and kyle@ alison
what are some examples
we have basalt and granite

Anonymous said...

WHAT I read about so far is that igneous rocks begins as hot fliud material. And the word igneous comes from the latin word fire. AND igneous rocks form in three main places litoshere plates and mid ocean riges, and sub duction zones. the types are granite,gabbro rhyolite

Dupont, Noah said...

Igneous means fire. Types of igneous rocks are fine grained, coarse grained, intrusive and extrusive. Examples of igneous rocks are obsidian, basalt, granite, gabbro, felsite, rhyolite, and peridotite. We find igneous rocks on the ocean floor, by volcanoes, and in the earth-underground.

Dupont, Noah said...

@Zach Viox
I know the hardness of a few, but not on the Moh's scale. I know Obsidian is sharp but isn't too hard, I would guess 6-7. Granite I have no idea though I know it is kinda hard. But yeah I agree I want to know some of the hardnesses of some of these rocks!

cirkovic, daniel said...

Igneous lava comes from hot fluid material, like lava and magma, that over time cools down to form a rock. Igneous comes from the word that means "fire" in Latin. Some examples of igneous rocks are etrusive rocks which are rocks that come from lava. Intrusive rocks come from shallow magma. Pultonic is rock that comes from deep magma. Igneous rocks form where lithospheric plates pull apart,where plates come together, and where contitnetal crust is pushed together (volcanoes).

MooreKassidy said...

Igeous rocks come from a hot fluid material.The word igneous comes from the Latin word meaning "Fire".There are 2 trypes of igeous rocks and they are Intrusive and Extrusive.Some examples are Gabrro,Pumice,etc.You can find them Where lithosheric parts are pulling away from each other.

Hannah Graff! said...

Igneous rocks come from hot fluid material. Igneous is latin for fire. The types of igneous rocks are :
*Extructive.
*Intrucive.
*Plutonic.
You can find the in where the lithospheric plates pull apart at mid-ocean ridges. You can find it where plates come together at subduction zones. You can also find it where continental crust is pushed together.

rentz,monica said...

igneous rock comes from hot fluid material. Ignaeous means in latin fire. we find them where lithospheric plates pull apart at mid ocean ridges. a example of igneous is intrusive and extrusive.

Hannah Graff! said...

@Abbey Rembold
I think is weird how the forms at mid ocean ridges!

georgantonis,pete said...

igneous rocks come from hot fluid material anoter type of rock is intrustive lithospherick plates pull apart mid ocean

Raines,Katrina said...

Igneous rocks come from hot fluid material which might have been lava. Igneous comes from the latin word "fire". The types of Igneous rocks are intrusive and extrusive. An example of Igneous rocks are basalt and rhyolite.

wessels,kelsey said...

Igneous rocks begin as hot, fluid material, and the word "igneous" comes from the Latin for fire.A type of ingneous rockis exstusive and intrusive. we fing these where lithospheres plates pull apart at mid ocean ridges.

Reis, Elizabeth said...

Igneous rocks come from hot, fluid material.
The different types include extrusive, intrusive, and plutonic.
Some examples are obsidian, granite and quartz.
We find igneous rocks on the deep sea floor, volcanic arcs, and the edges of continents.

georgantonis,pete said...

@ megan thats cool that igneous rocks are madeout of hot lava material

wessels,kelsey said...

@ abby remdold
I agree with you hannah its weird hom plate tectonics can involve with rocks and minerals.Also how ignoues rocks form from mid ocena ridges.

cirkovic, daniel said...

@andrew

Igneuos rocks can also form in deep pockets of magma like said on one of our science papers. Also to inform you where contiental plates are pushed together create volcanpes so magma flows out, melts and creates igneous rocks.

rentz,monica said...

@bonni

i think its col basalt can be extrusive or intrusive

rentz,monica said...

@bonni

i think its col basalt can be extrusive or intrusive

Calderon, Heidi said...

Igneous rocks begins from as hot, fluid material.
And igneous comes from the latin word for fire.
Types: basalt, granite, granitoid
Ex: extrusive and intrusive
You can find them at in the deep sea floor the oceanic crust.

dacoda said...

igneous rocks comes from hot fluid. an example is extrusive another is intrusive.

Calderon, Heidi said...

@ monica
i also think that the basalt is cool how if can be extrusive and intrusive

Anonymous said...

Igneous comes from the latin word for fire.Igenous rocks form where lithospheric plates pull apart at mid-ocean ridges, where they come together at subduction zones, and when they push together at continental plates. Three types of igneous rocks are intrusive rocks, extrusive rocks,and plutonic rocks. Intrusive rocks are rocks formed in shallow magma. An example of intrusive rock could be Basalt but Basalt could also be extrusive. Extrusive are formed of lava. Examples of extrusive rocks are obsidian and pumice. Plutonic rocks are formed in deep magma.

Anthony,Erb

martin,katie said...

At the most general level, rocks fall into three great categories, and they're pretty simple to tell apart. You won't even need a rock hammer or hand lens, though those are fun to have.
Igneous rocks are the first great class.
Igneous rocks begin as hot, fluid material, and the word "igneous" comes from the Latin for fire

gaddis,breanna said...

igneous rocks come from hot fluid materials. examples of igneous are intrusive and extrusive. you can find them where the lithosphere paltes pull apart at the mid ocean ridgess.

martin,katie said...

@abby thats cool you got some xstuff that i didnt nice job

Reis, Elizabeth said...

@Natalie
It is two different things, but I think what it means is that it could be extrusive or intrustive.
And that's funny because I always thought granite came a cold place too. It just seems like that.

gaddis,breanna said...

@moerhing
i think its weird how igneous is italian because it sounds like an american word. and if it does mean fire why dont we just call them fire rocks in america

Guthier Nick said...

Igneous comes from a hot fluid material when it cools up (magma). igneous comes from the latin word "fire". Types are feldspar, quartz, amphiboles and pyroxenes. We find them on the deep sea floor (the oceanic crust).

Thorp,Jayden said...

Ignous rock comes from hot fluid material. it is the latin word for fire. An example is moten lava rock.we find them when plates are pulled apart.

Guthier Nick said...

@Abby Rembold
I found that there deep sea not mid sea? Where did you see that?

waters,gabrielle said...

Igneous rocks comes from hot fluid material.It means fire in latin. An example of igneous rock is intrusive rock. You can find it where lithospheric plates pull apart at the mid ocean ridges.

Anonymous said...

IGNEOUS ROCKS!!
These are the total opisite of sedimentary rocks because igneous rocks are born from hot material. as in are notes igneous is the lastin word for fire... one example is extrusive rock. which is found in the lithosphere plates.
--SYdney POlking--

Anonymous said...

@ anna '
i also wonder what color the matiral is maybe blackish redsih grayish i dont no maybe we will find out later in this unit..
--SYdney POlking--

Haden, Mark said...

they come from volcaneo.you can find them by the volcaneo.

Haden, Mark said...

@anna
nice comment really.what did you think about it.

kallmeyer, bridget said...

@monni szary
extrusive and intrusive are not examples of igneous rocks they are types of igneous rocks. Basalt, and Granite are some examples of igneous rocks.

Anonymous said...

josh parsons- These rocks come from the ocean floor. The word igneous means fire. The types are basalt,granite and gabbro and ryolite. And if you dig throught the continents you will find igneous rocks.

Anonymous said...

Igneous rocks start from hot, fluid material. The word igneous comes from the latin word "fire". some types of igneous rocks are extructive and intrustive. Deep magma is also plutonic. Some examples of igneous rocks are quarts, feldspar and amphboles. When can find igneous rocks where lithosphere plates pull apart at mid-ocean ridge.

Anonymous said...

@Abby Rembold
I do agree with the comments and there are other ways we can find some igneous rocks such as were plates come together subduction zones. Also were continental zones are pushed together.

Anonymous said...

"igneous" comes from the Latin for fire. This material may have been lava erupted at the Earth's surface, or magma (unerupted lava) at shallow depths, or magma in deep bodies (plutons). Rock formed of lava is called extrusive, rock from shallow magma is called intrusive and rock from deep magma is called plutonic.


Igneous rocks begin as hot, fluid material

Anonymous said...

I wonder why they choose to name the Igneous rock from Fire?

Anonymous said...

@ Abby and Anna

Yeah, I would like to see what color its from too!

Anonymous said...

the name igneous comes from the lati word fire. it comes from lava or magma. the types of igneous rocks are basalt and granite.

CameronIan said...

igneous rock come from lava after it cools down. rocks that are formed here are rocks like obsidian. obsidian was used to hunt and to preform surgery.

stalbaum,lauren said...

Igneous rocks come from cooled molten rock, which makes since because igneous means 'fire'. You might find some rocks at the bottom of a volcano. some examples are: extrusive & intrusive.

Schwab,Izzy said...

igneous is latin for fire. igneous rocks are made from cooled hardened magma. there are intrusive igneous rocks and extrusive igneous rocks. you can find them at mid ocean ridges.

Joseph Pegg said...

Igneous rocks begin as hot, and fluid material. Rocks are from shallow magma is called Intrusive and rocks are also from deep magma. Igneous means latin of fire. Some examples are lithospheric plates pull apart at mid ocean ridges.

Anonymous said...

Michael Twilling

Igneous means fire. it forms from magma or lava

Anonymous said...

Michael Twilling

@Luke Namie for some reason i can't remember what quartz are

Taylor's blog spot said...

igneous rocks come from the latin word "fire", also came from where the lithospheric plates pull apart at ocean ridges. the types are intrusive, and etrusive. one exsample is magma

Taylor's blog spot said...

@jenn
isnt granit intrusive???????????

Anonymous said...

they come from hot fluid.Which is also latin for fire.Examples are extrustive and intrustive .They are found in mide ocean ridges.lyndsey roberto

Anonymous said...

they come from hot fluid.Which is also latin for fire.Examples are extrustive and intrustive .They are found in mide ocean ridges.lyndsey roberto

Fredrick, Kirk said...

Igneous Rock comes from the Latin for fire. Igneous Rock is lava erupted on the Earths surface. There are three types of Igneous Rock:Extrusive,Intrusive,Plutonic. Igneous rocks form in three main places: at mid-ocean ridges, at subduction zones and where continental crust is pushed together