Plate Tectonics & Soil

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12 Terms

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subduction zone

in tectonic plates, the site at which an oceanic plate is sliding under a continental plate.

<p>in tectonic plates, the site at which an oceanic plate is sliding under a continental plate.</p>
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convergent boundaries

Occur where two plates slide TOWARD each other, commonly forming a subduction zone

<p>Occur where two plates slide TOWARD each other, commonly forming a subduction zone</p>
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divergent boundaries

tectonic plates spreading apart, new crust being formed (ex. mid-ocean ridges, rift valleys).

<p>tectonic plates spreading apart, new crust being formed (ex. mid-ocean ridges, rift valleys).</p>
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continental plates

plates below the continents

<p>plates below the continents</p>
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oceanic plates

Thin plates that form the ocean floor; more dense than continental plates.

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O horizon of soil

Contains intact and decomposing organic material

<p>Contains intact and decomposing organic material</p>
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A Horizon of soil

topsoil with large amount of organic material

<p>topsoil with large amount of organic material</p>
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B Horizon of soil

subsoil

<p>subsoil</p>
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C horizon of soil

weathered parent material

<p>weathered parent material</p>
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Parent material

material from which a soil is formed, determines composition and properties of the soil

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Magma

Molten rock beneath the earth's surface

<p>Molten rock beneath the earth's surface</p>
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Percolation rate test

pouring water through a soil sample to see the speed at which water flows through soil. Depending on how quickly the water passes through the soil, nutrients may or may not be absorbed into the soil.