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16 Cards in this Set
- Front
- Back
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environment
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surroundings of an organism or groups of organisms
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Pedology
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the study of soil
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What makes up soil?
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Mineral (not living) and organic (material from living organisms) material
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decompose
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when plants and animals break down in the soil
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Humus
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the organic particles left when plants or animals decompose
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what does humus do?
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It holds large amounts of water
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recycling
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using materials again and again
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Weathering
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the breaking down of rocks into soil
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name 2 methods of weathering
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Physical or chemical
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Name three layers of soil
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topsoil, subsoil and bedrock
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bedrock
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a layer of solid rock below the subsoil
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erosion
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a natural process by which wind, water or ice carries away soil
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name the 3 characteristics of soil
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silty, sandy and clayey
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pH scale
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a system to measure whether a substance is acidic, basic or neutral
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acid rain
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rain with a pH of 5.0 or less
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the 3 primary plant food elements (or nutrients) are
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nitrogen, potassium and phosphorus
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