rock - weathering breaks down ______ by extreme forces of nature, core - the very centre of the earth, made out of extremely hot dense rock, crystals - minerals always have ______ arranged in precise patterns, sediment - Tiny pieces of rock and soil deposited by rivers and glaciers. , 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, mantle - the layer of the eath under the crust that has magma in parts, geologist - a scientist that studies the earth (rocks, soil),

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