Geologists study the composition of the Earth's crust using deep drill holes.
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Q9: The composition of the upper mantle is
Q10: The rise of the surface of the
Q11: The asthenosphere may be a partially melted
Q12: The Earth's core is made up of
Q13: Seismic waves travel faster in oceanic crust
Q15: Geologists think that the asthenosphere is molten.
Q16: The average heat flow of the continents
Q17: Generally, seismic wave velocity decreases with depth.
Q18: The concept of isostatic adjustment implies that
Q19: The average density of the Earth is
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