humus, rich in nutrients because it is full of decomposed plants and animals, soil, loose material that covers much of the Earth’s surface, weathering, the process in which rocks are broken down by water, air, or ice, topsoil, top layer of soil that is high in nutrients and best for plant growth, subsoil, layer of soil directly underneath topsoil; full of minerals, bedrock, solid rock layer beneath all soil, sand, soil made of large particles, does not hold water well, and has very few nutrients, silt, soil made of medium size particles, holds water well, loam, soil made of sand, silt, clay, and humus; best for growing plants, clay, soil made of the smallest particle size, holds water well, and is sticky when wet.

SOIL

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