rock - weathering breaks down ______ by extreme forces of nature, loam - a mixture of sand, silt, and clay, crystals - minerals always have ______ arranged in precise patterns, sediment - deposited by rivers and glaciers. Makes the soil more fertile, erosion - soil ______ is the loss of soil by water or wind (wearing away of soil), mineral - natural (not man made), has a crystal like structure, gem - a rare and valuable mineral, bedrock - bottom layer of the soil horizon. Part of the crust, humus - soft organic matter made from the remains of living things, gravity - water is pulled down by this force, topsoil - the layer right beneath the humus in the soil horizon, subsoil - the layer below the topsoil in the soil horizon, soil horizon - the layers of the soil: humus, topsoil, subsoil, bedrock, geologist - a scientist that studies the earth (rocks, soil),

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