Beneath Earth's surface, where does the heat exchange occur that moves tectonic plates?
A) convection cells
B) continental crust
C) subducting plate
D) mid-ocean ridge
E) ocean trenches
A) convection cells
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A cold air mass moving into an area occupied by relatively warm air is called a/an ________
A) cold front B) high pressure system C) low pressure system D) occluded front E) warm front
Which of the following factors does NOT control the stability of a slope?
A. whether the slope is rock or soil B. the orientation of fractures, cleavage, and bedding C. the amount of water in the soil D. the angle of repose for intact bedrock
Galaxies are aggregations of stars, stellar dust, and gas. Their masses
A. are small compared to blue supergiant stars. B. depend on the rate of pulsar emissions within them. C. vary greatly from one galaxy to the next. D. are all about the same, which is huge.
The first major transgression onto the North American continent is recorded in rocks of the
_______ Sequence. Fill in the blank(s) with the appropriate word(s).