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Rocks and the Rock Cycle


Dana Bailey

on 7 December 2012

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Transcript of Rocks and the Rock Cycle

Rocks and the Rock Cycle Virtual Tour Created by: Dana Bailey During this tour, you will be learning about the different kinds of rocks, their uses, and how they are formed in the rock cycle. Igneous rocks form when magma beneath the earth's surface begins to cool forming crystals. Igneous rocks are divided into two different categories depending on where it forms.
Extrusive Igneous Rock Intrusive Igneous Rock Are formed when magma exits and cools outside Earth's surface. Are formed when magma cools inside Earth's surface Examples: Igneous Rocks Granite Obsidian Sedimentary Rocks Sedimentary rocks are formed from pre-existing rocks or pieces of one-living organisms that accumulate in layers in a process known as deposition, When the sediments are compacted together to form new rock, lithification cements the particles together. Coal Halite Metamorphic Rock Metamorphic rocks are formed from pre-existing igneous rock sedimentary, or earlier metamorphic rock. When these rocks come in contact with heat and pressure they become metamorphic. Marble Igneous rock can become a sedimentary rock when magma cools and makes crystals. When the magma cools above ground, it cools quickly and becomes subjected to weathering. Igneous rocks become metamorphic when the igneous rock is broken down and then undergoes extreme hear and pressure changes. Law of Conservation Rocks and other materials cannot be created nor destroyed but can take on other forms. The law of conservation explains the recycling of rocks on Earth's surface since they can change forms and change back again.
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