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Q: With reference to the interior of the earth consider the following statements : 1. The earth's core is made up of very heavy material 2. The mantle extends from Moho's discountinuity to a depth of 2, 900 km 3. The material in the upper mantle portion is called magma Which of the statements given above is /are correct ?
  • A. 1 and 2 only
  • B. 2 and 3 only
  • C. 1, 2 and 3
  • D. 3 only
Correct Answer: Option C - The Earth's interior is generally divided into three major layers, the crust, the mantle and the core. The crust makes up less than 1 percent of earth by mass, the mantle is hot and 68 percent of earth's mass, the core is mostly iron metal. The mantle extends from Moho's discontinuity to a depth of 2,900 km. The depth of the upper mantle ranges between 250 to 410 miles (403 to 660 km). At this depth, rock can liquefy into magma. Magma then rises due to convection, and as it spreads it forms the ocean floor's crust.
C. The Earth's interior is generally divided into three major layers, the crust, the mantle and the core. The crust makes up less than 1 percent of earth by mass, the mantle is hot and 68 percent of earth's mass, the core is mostly iron metal. The mantle extends from Moho's discontinuity to a depth of 2,900 km. The depth of the upper mantle ranges between 250 to 410 miles (403 to 660 km). At this depth, rock can liquefy into magma. Magma then rises due to convection, and as it spreads it forms the ocean floor's crust.

Explanations:

The Earth's interior is generally divided into three major layers, the crust, the mantle and the core. The crust makes up less than 1 percent of earth by mass, the mantle is hot and 68 percent of earth's mass, the core is mostly iron metal. The mantle extends from Moho's discontinuity to a depth of 2,900 km. The depth of the upper mantle ranges between 250 to 410 miles (403 to 660 km). At this depth, rock can liquefy into magma. Magma then rises due to convection, and as it spreads it forms the ocean floor's crust.