viernes, 24 de septiembre de 2010

vocabulary 14 Building up breaking down

Fold mountain   a mountain made mostly of rocks layers folded by being squeezed together .








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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