APES 4.1 & 4.2

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Last updated 1:45 PM on 8/10/26
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11 Terms

1
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Mantle

Liquid magma layer beneath the Earth's crust.

2
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Asthenosphere

Solid magma layer located beneath the lithosphere.

3
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Lithosphere

Thin layer of rock that is broken up into tectonic plates.

4
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Divergent plate boundaries

Form mid-oceanic ridges, seafloor spreading, and rift valleys.

5
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Convergent plate boundaries

Form mountains, island arcs, and earthquakes.

6
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Oceanic-oceanic plate boundaries

Form mid-ocean volcanoes, offshore trenches, and island arcs.

7
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Oceanic-continental plate boundaries

Form coastal mountains, volcanoes on land, trenches, and tsunamis.

8
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O-Horizon

Layer of organic matter found on top of the soil.

9
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A-Horizon

Layer of humus with minerals from parent material and most biological activity.

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B-Horizon

Layer that contains little to no organic matter.

11
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C-Horizon

Layer that consists of bedrock.