Essay in soil pollution
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soil is the thin layer of organic and inorganic
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The original materials from which it has been formed through long ages are the rocks of the Earth's crust. There are three kinds of rocks made in three different ways. Igneous rocks were made when the molten material, of which the Earth consisted long ago, became cooler and solidified; granite, a very hard rock, is one of these. Another kind of rock is sedimentary rock, formed when rivers brought down small pieces of material with them as they flowed into the sea. The matter which they brought down with them fell to the bottom of the sea, and this sediment was slowly pressed and cemented together by other substances into rock. Then the crust of the Earth moved; the bottoms of the seas were raised and when they reached a sufficient height, became dry land. Sedimentary rocks are found in all kinds of places, even on high mountains. Shale, limestone and chalk are sedimentary rocks. The third kind of rock is metamorphic rock, a rock which has been made by change due to heat. This was formed, for instance, when the lava thrown out by volcanoes affected the material over which it flowed. The heat changed the surface underneath and produced different kinds of rocks, of which slate and marble are two.
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