The equator.
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True
There is no exact radius of the Earth, but the average is 3,959 miles or 20,903,520 feet. The Earth is rotating on it's axis and because of this rapid rotation the Earth's poles tend to flatten. Which makes the radius from the center to the equator larger than from the center to the poles.
i think its curved
true
biosphere ,hydrosphere ,atmosphere ,lithosphere are the four spheres of the earth