Fault block mountain a moutain made by huge tilled blocks of rocks separated from surrounding rock by fault .
Weathering the breaking down of rocks into smaller pieces by natural process .
Erosion the picking up and removal of rock particles .
Soil a mixture of weathe rock decayed plant and animal matter livig thing air and water .
Soil horizon any of the layers of soil from the surface to the bedrok below .
Ground water water that soaks into soil and rock by collecting in space between rock
particles .
Humus material i soil by the breakdown of plant and animal matarial .
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