Scientists have estimated the density of Earth
A) by averaging the density of several hundred crust samples.
B) by measuring the wobbly rotation of Earth on its axis.
C) by calculating its interaction with nearby celestial objects.
D) by taking a drilling core and averaging the density of those rocks over the depth.
Answer: B
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a. Sir John Ross b. Matthew Maury c. Fridtjof Nansen d. John Harrison
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A) Yangtze B) Huang He C) Xi D) Mekong E) Irawaddy
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