Unit 6 Vocabulary: Structure of Earth

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ASTHENOSPHERE

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The upper layer of the Earth's mantle, below the lithosphere.

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ATMOSPHERE

Back

Gases that surround the Earth or another planet.

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Geosphere

Back

The scientific name for the solid parts of a planet.

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COMPOSITION

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What something is made of.

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Magma

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Molten rock beneath the Earth's surface.

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INNER CORE

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The innermost geological layer of the Earth, primarily a solid ball with a radius of about 1,220 km (760 mi).

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MANTLE

Back

The mantle is located between the Earth's dense, super-heated core and its thin outer layer, the crust. It is approximately 2,900 kilometers (1,802 miles) thick.

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Igneous Rock

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A type of rock that forms from the cooling and solidification of magma or lava.

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Sedimentary Rock

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A type of rock that forms from compaction and cementation.

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GEOLOGIST

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A scientist who studies the Earth.