Question

1.
The most commonly available mineral on the
surface of the Earth is/are:
a. iron b. aluminium c. silicates d. sodium​

Answer 1

Answer:

feldspar

If you consider it as one mineral, feldspar is the most common mineral on earth, and quartz is the second most common. This is especially true when you consider the whole crust (continental plus oceanic)

Answer 2

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silicates.

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