1
Question
Approximately about 90% of earth's crust is made up of _____
Approximately about 90% of earth's crust is made up of _____
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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.
(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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