Approximately about 90% of earth's crust is made up of _____

Silica

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silicates

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Carbides

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(a) and (b) combined

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Solution

The correct option is D
(a) and (b) combined

Silicon dioxide is commonly known as silica. Ninety-five percent of the earth's crust is made up of silica and silicates. Silica occurs in many crystallographic forms such as quartz, crystobalite and tridymite. These are inter-convertible at suitable at suitable temperatures.

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