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,

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