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Teclas de Derecha/Izquierda: Navegar entre tarjetas.tecla derechatecla izquierda
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13 Cartas en este set
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what is soil?
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The loose material on the Earth's surface above the solid rock.
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Characteristics of topsoil.
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Most important layer for farmers
black because of high concentration of humus contains many minerals holds soil particles together to prevent soil erosion |
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what is the Subsoil?
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it is the material accumulated from horizons above and below and contains small fragments of rock.
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what is the bedrock?
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contains loose pieces of rock of large diameter which are broken down by weathering from the parent rock below
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what is soil texture?
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balance in which mineral particles are resent in the soil.
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what is SOIL EROSION?
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Is the loss of topsoil by wind and water.
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Explain why sandy and clayley soils are not as good for farming.
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Pore spaces: sandy- large clay-very small
Areation: sandy- large pores hold air-clay:air excluded Drainage: sandy- no waterlogged-clay- waterlogged Nutrients: sandy- short suppply and soon washed out clay- nutrient rich but too much water and little air ease of use: sandy-light clay- break up and turn dif. |
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State 3 reasons why loamy soils are good for farming.
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moderate, ease of use, etc
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Why topsoil is important for farmers?
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It is important as it contains the organic matter from plants an danimals which is then turned into nutrient that are neccesary to soil fertility in order to plough crops.
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What is LEACHING?
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The removal of soluble minerals from the topsoil into the subsoil by water rain. LOSS OF NUTRIENTS
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What is deforestation?
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It is the clearence of natural vegetation.
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Causes of deforestation?
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A Cultivation: increse in population-larger areas of farming to grow crops
Ranching: forest cleared to put cattles Logging:n clearing to obtain wood,fuel,paper,buildmat heavy machinery used Energy: produce energy from wood and hep |
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How deforestation affects the cycle?
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forests are cut down on large scale and the amount of moisture in atm is reduced
plants removed so ther is no transpiration and rainwater goes straight into the soil streams or river creating drier air and therefore less rain |
