Eclogite is the world's most dense rock of siliceous matter. It is used for roads, abrasives, and monuments. It sometimes contains:
A
diamonds
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B
chromium
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C
lead
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D
uranium
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Solution
The correct option is B diamonds Eclogite is a metamorphic rock consisting of pyroxene omphacite and pyrope-rich garnet. It is a rare but geologically significant rock type. It is common in the upper mantle, especially in regions occupied by subducted oceanic plates. Eclogite forms at pressures greater than those typical of the crust of the Earth and hence some eclogites have been found having diamonds in them.