23 July, 15:26
In addition to paleomagnetism, what other evidence was needed to determine the rate of seafloor spreading?
A the strength of the magnetic field
B the age of each strip of rock
C minerals in the rocks
D the thickness of the rock layers
What causes the earth's magnetic field?
A currents in the earth's liquid-metal outer core
B magnetic particles located at the earth's poles
C molten material in the mantle
D the mineral composition of the earth's crust
23 July, 16:13
For the first question, the age of each strip of rock is needed to determine the rate of seafloor spreading. The answer is B.
For the second question, the answer is A.
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» In addition to paleomagnetism, what other evidence was needed to determine the rate of seafloor spreading?