Answer:
(i) In sedimentary rocks, a number of minerals occur in beds or layers. (ii) They have been formed as a result of deposition, accumulation and concentration in horizontal strata. (iii) Coal and some forms of iron ore have been concentrated as a result of long periods under great heat and pressure. (iv) Another group of sedimentary minerals includes gypsum, potash salt and sodium salt. These are formed as a result of evaporation especially in arid regions.
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