Who first proposed that Earth acted as a large magnet whose field forces the needle of a magnetic compass to align north-south?
A) Charles Darwin
B) William Gilbert
C) James Hutton
D) Charles Lyell
Correct Answer:
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Q23: Seismic wave speeds increase with
A)decreasing density and
Q24: According to a recent hypothesis,mantle plumes that
Q25: What drives plate tectonics?
A)erosion
B)solar energy
C)thermal conduction
D)thermal convection
Q26: Which of the following regions is hottest?
A)the
Q27: At what depth does the transition from
Q29: The boundary between the mantle and the
Q30: The temperature at the center of Earth
Q31: Based on seismic tomographic images,how deep do
Q32: Which of the following regions is the
Q33: What cause large-scale variations in Earth's geoid?
A)variations
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