Earth's magnetism is likely produced by
A. surrounding radiation belts above the atmosphere
B. magnetite deposits in its deep interior.
C. convection cells beneath its surface.
D. none of the above
Answer: C
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What is the best-known and oldest deep-diving manned research submersible now in operation?
a. Trieste b. Jiaolong c. Challenger d. Alvin e. Shinkai
Covalent bonds are found in quartz. What could this suggest about its physical properties?
A) It is a harder mineral. B) It is purple. C) It is malleable. D) It is a conductor of electricity.
We are able to see the sun for several minutes AFTER it has slipped below the horizon because:
A) we are unable to perceive light bending. B) Actually, we can't see the sun once it is below the horizon. C) our eyes are able to recognize internal reflection. D) ice crystals have diffracted the light.
An equivalent map projection preserves true shape
Indicate whether the statement is true or false