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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.
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