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Rock cycle

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by

Jeremy Brunner

on 7 September 2010

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Transcript of Rock cycle

Most Igneous rocks form underground.
THE ROCK CYCLE
Melted rock is called Magma
First, let's see how IGNEOUS rocks are made.
When magma hardens, it makes Igneous rocks.
Examples of Igneous Rocks:
Basalt
Granite
Pumice
Obsidian
Some Igneous rocks form when volcanoes erupt!
Not all rocks are Igneous.
Some rocks are smashed and baked, but not melted.
These rocks are called
METAMORPHIC.
After thousands of years, the intense heat and pressure makes new rocks.
Examples of Metamorphic Rocks:
Gneiss
Marble
Quartzite
Schist
Slate
There's one more way rocks are made.
Examples of Sedimentary Rocks:
Sandstone
Shale
Limestone
Conglomerate
Over thousands of years the grains of sand get cemented together and form brand new rocks.
Water breaks big rocks into little rocks.
Little rocks break into peices of sand.
This process creates SEDIMENTARY rocks.
These changes are a cycle!
(They happen over and over.)

Igneous
Metamorphic
Sedimentary
Goes through heat and pressure to create...
Turns into magma and cools down to create...
Turns into magma and cools down to create...
Goes through erosion and compaction to create...
Goes through erosion and compaction to create...
Goes through heat and pressure to create...
It can go the other way too!
In fact, the Rock Cycle never ends! A rock is constantly in the process of changing. It can take a million years for one rock to change into another one.
Full transcript