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8th Grade Science

Chapter 4 - Rocks

TermDefinition
Rock Cycle Model that describes how rocks slowly change from one form to another through time
Rock Mixture of one or more minerals, rock fragments, volcanic glass, organic matter, or other natural materials; can be igneous, metamorphic, or sedimentary
Sedimentary Rock Forms when sediments are compacted and cemented together or when minerals form from solutions
Igneous Rock Rock formed when magma or lava cools and hardens
Metamorphic Rock Forms when heat, pressure, or fluids act on igneous, sedimentary, or other metamorphic rock to change its form or composition, or both
Intrusive Describes a type of igneous rock that generally contains large crystals and forms when magma cools slowly beneath the Earth's surface
Extrusive Describes fine-grained igneous rock that forms when magma cools quickly at or near the Earth's surface
Basaltic Describes dense, dark-colored igneous rock formed from magma rich in magnesium and iron and poor in silica
Granitic Describes generally light-colored, silica-rich igneous rock that is less dense than basaltic rock
Foliated Describes metamorphic rock, such as slate and gneiss, whose mineral grains line up in parallel layers
Created by: LeMay1
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