discuss the economic importance of igneous sedimentary and metamorphic rocks
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(i) Coal and petroleum are major sources of power. (ii) Bricks from clay, cement from limestone and glass from sand is obtained. (iii) Limestone is used for buildings purpose. The igneous rocks are crystalline rocks and hence are very rich in minerals of great economic value.
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Mention the economic significance of sedimentary and igneous rocks. The sedimentary rocks are not very rich in minerals. But some of the minerals found in sedimentary rocks which are of economic value are such as haematite iron ore; phosphates, building stones, coal, materials for making cement, petroleum.
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