Multiple Choice
How do geologists know that the magnetic field of Earth has changed constantly over time?
A) by the direction of historical lava flows, which they have been able to date with radioactive dating methods
B) by crystals that have formed in metamorphic rocks
C) by records kept in magnetic rock-forming minerals
D) by analyzing and extrapolating records kept by scientists since the 1600s
Correct Answer:
Verified
Correct Answer:
Verified
Q21: Which type of heat transfer occurs without
Q22: What hypothesis has been presented for the
Q23: What is a dynamo?<br>A) a rotating body
Q24: What did Glatzmaier and Roberts' model suggest
Q25: How many years were required for a
Q27: How could the mantle be too thin
Q28: Liquid metal at the base of the
Q29: How long did the supercomputer require to
Q30: What key features have emerged through the
Q31: Which of the following is not an