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10 Cards in this Set
- Front
- Back
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humus
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Dark-colored, decayed organic matter that supplies nutrients to plants and is found mainly in topsoil
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horizon
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Each layer in a soil profile – A= top layer of soil, B=middle layer, C=bottom layer
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mechanical weathering
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The breakdown of rock into smaller pieces by physical means
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climate
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The average weather condition in an area over a long period of time. (Ex: dry or humid)
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ice wedging
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A type of frost action that starts when water seeps into cracks, then freezes and expands causing the crack to widen
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abrasion
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The grinding and wearing away of rock surfaces through the mechanical action of other rock or sand particles
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oxidation
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The chemical reaction in which an element, such as iron, combines with oxygen to form an oxide.
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chemical weathering
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The process by which rocks break down as a result of chemical reactions. Common agents are water, weak acids, and air.
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acid precipitation
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Rain, sleet, or snow that contains a high concentration of acids
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lichens
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Produce acids that slowly break down rock. They grow in places where some of the hardiest plants cannot, consist of fungi and algae living together
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