Rock Types

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foliated

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a type of metamorphic rock characterized by wavy layers

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non-foliated

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a type of metamorphic rock that does not contain wavy layers

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intrusive

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a type of igneous rock formed from magma cooling slowly underground, characterized by large mineral grains

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extrusive

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a type of igneous rock formed from magma cooling quickly on Earth's surface, leading to small or no visible mineral grains, or giant holes from air bubbles.

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clastic

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a type of sedimentary rock formed from pieces of other rocks and sand, cemented together over thousands of years.

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chemical

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a type of sedimentary rock formed when water evaporates leaving chemicals behind that bind rock fragments together, sometimes in crystalline formations

Tags

NGSS.MS-ESS2-4

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organic

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a type of sedimentary rock that contains the remains of once living organisms.

Tags

NGSS.MS-ESS2-3

NGSS.MS-LS4-1

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sedimentary rocks

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formed from chunks of other rocks or minerals compacted and cemented over thousands of years.

Tags

NGSS.MS-ESS2-3

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metamorphic rocks

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rocks formed from heat and pressure deep inside Earth

Tags

NGSS.MS-ESS2-1

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igneous rocks

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formed from the cooling of magma deep inside Earth or lava on Earth's surface