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3.4 Soil
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Why does clay soil have little air?
small particles packed tightly
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Why must soil be turned regularly?
mix air and organic matter
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What type of soil forms from igneous rocks?
sandy clay soil
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What does soil texture describe?
how soil feels
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How can artificial fertilisers damage soil?
dry the soil
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How is soil formed?
weathering of rocks
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What does the colour of soil indicate?
amount of organic matter
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How can growing the same crop damage soil?
removes nutrients
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What type of soil forms from sandstone?
sandy soil
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What else does organic matter provide?
nutrients
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What is the particle size of sandy soil?
large
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What must farmers do if there is no rain?
water the soil
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What are the main components of soil?
rock particles, organic matter, air, water
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What type of soil forms from shale?
clay soil
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How can pesticides harm soil?
kill organic matter
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Why does sandy soil drain water easily?
large air spaces
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Why is loam suitable for growing plants?
balanced composition
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What type of soil is best for rice farming?
clay soil
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How is compost different from artificial fertiliser?
improves texture
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What is the particle size of loam?
mixed
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Why does sandy soil contain more air?
large particles
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Why does clay soil become waterlogged?
water cannot drain
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How does organic matter help soil?
holds water
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Why is compost added to soil?
replace nutrients
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Why must nutrients be replaced?
plants use them up
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How do farmers add air into soil?
digging
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Give two words that can describe soil texture.
sticky crumbly
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What is needed in soil to maintain its composition?
air
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What happens to clay soil in hot weather?
it cracks
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What is the particle size of clay soil?
small
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