how do minerals occur in (a) igneous and metamorphic rocks . ( b) in sedimentary rocks ?
Answers
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a. In igneous and metamorphic rocks, minerals may occur in the cracks, crevices, faults or joints. The smaller occurrences are called the veins and the larger ones are called lodes. In most cases, they are formed when minerals in liquid/molten and gaseous forms are forced upward through cavities towards the earth's surface. They cool and solidify as they rise. Major metallic minerals like tin, copper, zinc, and lead, etc. are obtained from veins and lodes.
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b. In sedimentary rocks, a number of minerals occur in beds or layers. They have been formed as a result of deposition, accumulation, and concentration in horizontal stratas. Coal and some forms of iron ore have been concentrated as a result of long periods under great heat and pressure. Another group of sedimentary rocks include gypsum, potash, salt, and sodium salt. These are formed as a result of evaporation, especially in arid regions.
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Answer:
Explanation:
Igneous rock: in the form of veins and lodes
eg: copper
Sedimentary rocks: in the form of layers or strata
eg: coal