Over ________ of Earth's magma extruded through volcanism takes place at the oceanic spreading centers.
A. 70%
B. 60%
C. 50%
D. 80%
E. 90%
Answer: D
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The hydrologic cycle refers to the ________
A) totality of the forms of precipitation B) unending circulation of Earth's water supply C) flow of rivers D) groundwater flow to the surface E) latent heat of vaporization
________ is name given to NEOs composed of rocky and/or metallic material that are best described as
A. Comets; dirty snowballs that are vaporized by the solar wind as they get near the sun. B. Asteroids; small chunks of rock knocked loose from a belt between Mars and Jupiter. C. Bolides; space debris that bounces off of other stuff in space. D. Meteorites; small clumps of cosmic material that originated in the Oort cloud. E. None of these choices are correct.
Who coined the term "oceanography"?
a. Maury and Franklin b. Wilkes and Murray c. Thomson and Darwin d. Thomson and Murray e. Murray and Darwin
Winds are always labeled by the direction from which they blow. So, the Westerlies blow from east to west.
a. true b. false