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Igneous rock formation

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sierra holmes

on 25 September 2013

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Transcript of Igneous rock formation

Igneous Rock Formation
Intrusive Igneous Rock
Volcanic and Lava Rocks
How is igneous rock formed?
The formation of igneous rock
Examples of intrusive igneous rock

Igneous rocks are called fire rocks
formed either underground or above ground.
Underground, they are formed when the melted rock (magma) deep within the earth becomes trapped in small pockets.
As pockets of magma cool slowly underground, the magma becomes igneous rocks.


Intrusive igneous rocks cooled below the surface of the planet

Extrusive rocks are formed from magma at or above the surface of the planet

Lava Rock:
Igneous rock formation happens when sedimentary rocks are remelted.
takes place at subduction zones.
sedimentary rocks sitting on subducting plate is pulled down.
Tremendous heat generated as the two plates grind against each other.
This heat and the heat of the underlying magma melts the rock.
The rate at which the magma cools determines the kind of igneous rocks that are formed.
Examples of Extrusive
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