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THE ROCK CYCLE

First, let's see how IGNEOUS rocks are made.

Melted rock is called Magma

When magma hardens, it makes Igneous rocks.

Most Igneous rocks form underground.

Some Igneous rocks form when volcanoes erupt!

Not all rocks are Igneous.

There's one more way rocks are made.

This process creates SEDIMENTARY rocks.

These changes are a cycle!

(They happen over and over.)

Goes through heat and pressure to create...

Goes through erosion and compaction to create...

Turns into magma and cools down to create...

It can go the other way too!

Goes through erosion and compaction to create...

Sedimentary

Goes through heat and pressure to create...

Metamorphic

Turns into magma and cools down to create...

Igneous

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.

Basalt

Pumice

Examples of Igneous Rocks:

Granite

Obsidian

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:

Quartzite

Gneiss

Marble

Slate

Schist

Water breaks big rocks into little rocks.

Little rocks break into peices of sand.

Conglomerate

Examples of Sedimentary Rocks:

Over thousands of years the grains of sand get cemented together and form brand new rocks.

Limestone

Shale

Sandstone

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