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an important way that scientists have been able to study the interior of the earth is by:
a. studying the exterior, which is made of exactly the same material.
b. digging deep trenches at the bottom of the ocean, which is a lot closer to the planets center.
c. mesauring how scismic waves are transmitted through the earth.
d. using spacecraft that can detect radio waves coming from the center.
e. there is no way we can study the earths deep interior at the present time.
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