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CLASSIFYING ROCKS

6.10B CLASSIFYING ROCKS

TermDefinition
EARTH'S EVOLUTION Process that formed & changed planet Earth from its beginning to the present.
MINERAL COMPOSITION Unique combination of solid elements & compounds that make up a mineral.
ROCK CYCLE Earth's rocks change from 1 type into another over time due to various Earth processes; changes occur in mineral compositions & physical structures.
IGNEOUS ROCK Formed when lava or magma cools & solidifies; lava (above ground) cools quickly & forms rocks with small crystals, while magma (below ground) cools slowly & 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 Formed deep underground where heat & pressure cause existing rocks to be changed in both mineral composition & structural characteristics.
HEAT and PRESSURE Changing variables due to the weight of overlying rocks, causing changes to rock characteristics & mineral composition, thus forming metamorphic rocks.
SEDIMENTARY ROCK Forms when particles of other rocks are deposited in layers & are compacted (crushed together), & cemented (binding of sediments).
COMPACTION Occurs when rock particles or sediments are pressed together or packed down by gravity & the pressure of overlying rock layers.
CEMENTATION Occurs when compacted sediments stick together & turn into rock.
Created by: trauberk