There isn`t anyplace with zero gravity. Every thing in the universe has an amout of gravity excerting to all masses. Although it may be minute it still exists.
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There are approximately 57.5 million square miles of land on earth, only 29.2 percent of the earth's surface.
earthquakes affect the surface of the earth by cracking or opening the surface of the earth or by changing it in many different ways
The earth's diameter is about 12,600km, so half that would be 6,300km from the surface to the core.
Earth's radius is 6371 kilometers, on average. Divide that by 1.6 to convert to miles.
The polar circumference of the earth is 24860.535 miles (according to www.koordinaten.de/english/informations/earth.shtml)