Since in its early history the earth was too hot for liquid water to exist, it has
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Since in its early history the earth was too hot for liquid water to exist, it has been the orized that all of the water on the earth came from collisions of comets with the earth. Assume an average diameter for the head of a comet and assume that it is completely composed of water ice. Estimate the volume of water on the earth and estimate how many comets would have collided with the earth to supply this much water.
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