When does soil begin to form?

Which of the following does not help to break apart rocks?

How do plants help break apart rock?

How do animals help break apart rock?

How to bacteria and fungi help make soil?

What is humus?

What is soil made from?

How long does soil take to form?

Complete the sentence - Soil forms in:

What is a soil horizon?

Which one describes the A horizon/topsoil best?

Which one describes the B horizon/subsoil best?

Which one describes the C horizon best?

What is a soil profile?

What lies beneath the A, B, and C horizon of soil?

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