how big is the world in kilometers
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how big is the world in kilometers
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size of the world in miles
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how big is the world in kilometers, how long is the world in kilometers, how large is the world in miles, how wide is the world in miles, how many kilometers is around the world, how many km is the world, how many miles is in the world, size of the world in miles, how many miles wide is the world, how many miles is the entire world