What causes rocks to break down and turn to soil?, Which soil should a farmer use to grow many types of crops?, Describe clay. (Color, texture, how much water does it hold?), Describe sand. (Color, texture, how much water does it hold?), Describe loam (Color, texture, how much water does it hold?), What is soil made out of?, How do worms help soil?, How does rain and snow help soil?, What is soil made out of? , What is humus?.

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