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Foreman/Stapp 13

Classifying Rocks - 6.10B

TermDefinition
Earth’s Evolution The process that formed and changed the Earth from its beginning to the present.
Mineral Composition The unique combination of solid elements and compounds that make up a mineral.
Rock Cycle Earth's rocks change from one type into another over time due to various Earth processes. Changes occur in mineral compositions and physical structures.
Igneous Rock Igneous rock is formed when lava or magma cools and solidifies. Lava cools quickly and forms rocks with small crystals, while magma cools more slowly and forms rocks with larger crystals.
Lava Molten rock or magma that has reached Earth’s surface by volcanic action; characterized by small crystals due to rapid cooling on Earth’s surface.
Magma Melted or molten rock material beneath Earth’s surface; cools slowly to form rocks with larger crystals.
Metamorphic Rock Metamorphic rock is formed deep underground where heat and pressure cause existing rocks to be changed in both mineral composition and structural characteristics.
Heat and Pressure Changing variables due to the weight of overlying rocks, causing changes to rock characteristics and mineral composition, thus forming metamorphic rocks.
Sedimentary Rock Sedimentary rock forms when particles of other rocks are deposited in layers and are compacted (crushed together), and cemented (binding of the sediments).
Compaction Occurs when rock particles or sediments are pressed together or packed down by gravity and the pressure of overlying rock layers.
Cementation Occurs when compacted sediments stick together and turn into rock.
 



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