Which element is the second most abundant in the Earth's crust? MCQ with Answer and Explanation

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Which element is the second most abundant in the Earth's crust?

A. Magnesium

B. Iron

C. Silicon

D. Calcium

Answer: Option C

Solution (By JKSSB Mock Tests)

Silicon makes up about 27.7% of the Earth's crust and combines with oxygen to form silicate minerals.

This question belongs to: Geography GK Physical Geography

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The Walker Circulation is most closely associated with:

A. Jet streams

B. Plate tectonics

C. El Niño-Southern Oscillation

D. Monsoon troughs

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Correct Answer: Option C

Explanation:
Walker Circulation is a major atmospheric circulation pattern in the tropical Pacific.

This question belongs to: Geography GK Physical Geography

Question #2

Which geologic eon occupies the largest portion of Earth's history?

A. Phanerozoic

B. Precambrian

C. Proterozoic

D. Archean

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Correct Answer: Option B

Explanation:
The Precambrian accounts for nearly 88% of Earth's geological history.

This question belongs to: Geography GK Physical Geography

Question #3

The Mohs scale is used to measure:

A. Volcanic Activity

B. Rock Density

C. Mineral Hardness

D. Earthquake Intensity

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Correct Answer: Option C

Explanation:
The Mohs scale ranks minerals based on their ability to scratch one another.

This question belongs to: Geography GK Physical Geography

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