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The forces of nature-climate,wind, and wateer-change rock to soil.This process is called weathering. These forces gradually break down large rocks into smaller and smaller particles, eventualy forming soil.Organic matter such as dead leaves and plants and animals remains decay to form humus, which is an important part of soil because it is rich in nutrients. In some areas,volcanic ash provides a particularly rich supply of mineral nutrients.
refrence:Heinemann-Integrated Science for Caribbean Schools Book 2