Extrusive Igneous Rock - produced when magma exits and cools above (or very near) the Earth's surface. Causes the rock texture to be fine-grained, Intrusive Igneous Rock - Igneous rocks form below Earth's surface when magma intrudes into existing rock layers and cools. Causes the rock texture to be rough or course., sedimentary rock - formed from pre-existing rocks or pieces of once-living organisms, metamorphic rock - started out as some other type of rocks, but have been substantially changed from their original form, magma - extremely hot liquid and semi-liquid rock located under Earth's surface, weathering - breaks down rocks, erosion - carries rock pieces away, deposition - drops the pieces of rock, cementation - crystals hold the sediment grains together, metamorphism - change of composition or structure of a rock by heat, pressure, or other natural agency, stratification - the layering that occurs in most sedimentary rocks and in those igneous rocks formed at the Earth's surface, as from lava flows and volcanic fragmental deposits,

Rocks and Minerals Definitions

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