P-waves refract at the boundary between inner and outer core because
A) there is a change of phase between inner and outer core.
B) there is a change in chemical composition between inner and outer core.
C) they gain speed.
D) they lose speed.
A
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Friction
A) increases with altitude. B) is greater near the ground surface. C) diminishes turbulence. D) is responsible for weaker winds aloft.
Based on the photographs of La Conchita, California, what type of slope failure occurred?
A) Rock avalanche B) Debris flow C) Creep D) Rock fall E) Earth flow
At what time of year is the earth's axis not tilted either toward or away from the Sun?
A) autumnal equinox B) aphelion C) summer solstice D) perihelion E) winter solstice
In 1985, ________ produced a minor eruption that melted part of a glacier near its summit, sending a lahar down its slopes and killing at least 22,000 people.
A. Vesuvius, Italy, B. Nevado Del Ruiz, Colombia, C. Popocatepetyl, Mexico, D. Mt. Mayon, Philippines, E. Mont Pelée, Martinique,