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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