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Rocks and the Rock Cycle
Transcript of Rocks and the Rock Cycle
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.