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*Front:* Earth Science

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of Earth's structure, properties, processes, and history

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*Front:* Asthenosphere

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layer beneath the lithosphere

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*Front:* Outer Core

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layer composed of iron and nickel

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*Front:* Subduction Zone

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where one tectonic plate slides beneath another

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*Front:* Convection Current

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of fluid caused by temperature differences

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*Front:* Plate Tectonics

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explaining the movement of Earth's plates

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*Front:* Mantle Convection

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transfer within the mantle causing plate movement

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*Front:* Igneous Rocks

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from cooled magma or lava

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*Front:* Sedimentary Rocks

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from compacted and cemented sediments

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*Front:* Metamorphic Rocks

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from existing rocks under heat and pressure