ASVAB Skilled Technical Practice Test

The distance from the Earth's surface to its center is approximately

1,000 miles 2,500 miles 8,000 miles 4,000 miles

Correct Answer:

4,000 miles

Explanation:

The distance from the surface to the center is the Earth's radius—the line from the center to the surface. The Earth’s average radius is about 3,959 miles, so rounding gives 4,000 miles. The other options don’t fit because 1,000 miles and 2,500 miles are far too small to reach the center, and 8,000 miles would be the full diameter (the distance across the Earth through the center). If you were asked for the diameter, you’d double the radius to about 8,000 miles.

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