The significance of any great circle is that it always
A) connects two points on the surface of a sphere with the shortest distance.
B) follows the same line of latitude.
C) passes through the point where the equator intersects with the Prime Meridian.
D) passes through the North or South Pole.
A) connects two points on the surface of a sphere with the shortest distance.
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The Mohorovicic discontinuity marks the change in rock density between the
A. core and the mantle. B. mantle and crust. C. inner and outer core. D. asthenosphere and lithosphere.
Which of the following are not differences between an eruption column and pyroclastic flow?
A) Tephra in an eruption column mostly cools before it reaches the ground. B) A pyroclastic flow mostly flows downhill, whereas a column rises at first. C) Damage from an eruption column can be more widespread. D) Pyroclastic flows form from a higher gas flux.
Which of the following air masses are dominant over the southeastern U.S., especially in the summer season?
A) mP B) cP C) cA D) mT
What is the texture of this rock?
A) Schistosity B) Nonfoliated C) Slaty cleavage D) Gneissic banding