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Rocks

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by

Jerry Wilson

on 22 January 2013

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Transcript of Rocks

Rocks The Rock Cycle A rock is a solid mixture of minerals and fragments of other rocks. A mineral is a naturally-occuring crystalline solid that did not come from living organisms. The rock cycle shows how rocks can change from one type to another through various processes. Sediments Magma Sedimentary Rock Metamorphic Rock Igneous Rock Heat & Pressure Melting Heat & Pressure Compaction Melting Weathering
& Erosion Cooling Types of Rocks: Igneous - Rocks produced from cooling lava and magma
Sedimentary - Rocks formed from the compaction and cementation of fragments called sediment
Metamorphic - Rocks formed from other rocks under intense heat and pressure but without melting Igneous Rocks Igneous rocks are formed from magma or lava that cools and hardens. Magma is molten rock beneath the surface. When magma rises to the surface, it is called lava. Extrusive igneous rock forms from lava. It cools fast and forms tiny crystals or sometimes no crystals. Examples: Basalt, Pumice Intrusive igneous rock is formed below the surface. Magma cools slowly and forms large crystals.
Examples: Granite, Gabbro Granite Pumice Sedimentary Rocks Sedimentary rocks form when fragments of shells, rocks, sand, and soil (sediment) are compressed, called campaction, and cemented together, called cementation, to form a rock. This happens in seas and lakes. Some sedimentary rocks are formed when water evaporates and leaves dissolved chemicals behind. Limestone and rock salt are examples. Limestone Some sedimentary rock contains large pieces of shells or pebbles. Others contain very small sediment, such as sand or clay. Coquina Compacted shells Sandstone Metamorphic Rocks Metamorphic rocks are rocks that have been changed due to intense heat and pressure over millions of years. Metamorphic rocks come in two types:
Foliated - These have visible bands or layers.
Nonfoliated - These do not have bands or layers. Schist Foliated Marble Nonfiliated OurSciencePage.com Know Your Rocks! http://OurSciencePage.com/rocks.htm
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