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Q: What is the second most abundant element on Earth’s crust?
  • A. Carbon
  • B. Silicon
  • C. Oxygen
  • D. Hydrogen
Correct Answer: Option B - The elements available in the earth's crust respectively are: (Oxygen (46%), Silicon (27.72%), aluminum (8.13%) lron (5%), Calcium (3.63%), Sodium (2.83%), Potassium (2.49%), Magnesium (2.00%), hence option (B) is correct.
B. The elements available in the earth's crust respectively are: (Oxygen (46%), Silicon (27.72%), aluminum (8.13%) lron (5%), Calcium (3.63%), Sodium (2.83%), Potassium (2.49%), Magnesium (2.00%), hence option (B) is correct.

Explanations:

The elements available in the earth's crust respectively are: (Oxygen (46%), Silicon (27.72%), aluminum (8.13%) lron (5%), Calcium (3.63%), Sodium (2.83%), Potassium (2.49%), Magnesium (2.00%), hence option (B) is correct.