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a very small piece of a hard thing
grain
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the part of soil made of dead plants or animals
humus
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Most plant roots are in the top layer of soil. True or False?
TRUE
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What happen when rocks are weather?
They break down into smaller pieces.
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How many main layers of soil are there?
There are 3 main layers of soil: the top layer, the middle layer and the bottom layer.
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a number of things on top of each other
pile
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What happen when plants or animals die?
They decompose into humus.
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When grain mixed with humus, what do they become?
They become soil.
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Name the different things that make up soil.
Soil is a mixture of weathered rocks, humus, minerals, air, and water.
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What happen when animals dig into the soil?
They move the humus down.
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Guess the word
dig
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