How did we know about the internal structure of the Earth?
A. by studying typhoon and hurricane
B. by studying tidal waves and sea waves
C. by studying electromagnetic waves and radio waves
D. by studying volcanic eruption and earthquake waves
A. by studying typhoon and hurricane
B. by studying tidal waves and sea waves
C. by studying electromagnetic waves and radio waves
D. by studying volcanic eruption and earthquake waves
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D. by studying volcanic eruption and earthquake waves