How do geologists know about the inside of the earth?
a) they have drilled holes into the earth and sent sensors down to its center
b) they study very large canyons that have been uplifted from the center of the earth
c) they study the movement of earthquake waves throughout the earth
d) they study the movement of water waves in the ocean
e) they have built a ship that can dig into the earth and take a team of scientists to its center
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