86. Which of the following rocks is used as an abrasive in cleaning, smoothing and polishing?
87. Chemical weathering is associated with
(a) Disintegration of rocks
(b) Erosion of rocks
(c) Oxidation of rocks
(d) Corrosion of rocks.
88. Study the given map and answer the question.
Which of the above areas is most ideal for coral reef formation?
Answer : (a)
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