Hi there! The answer is B. Driest.
The great plains is a region in the centre of the US and is (mostly) located low. It spreads from the northern to southern US, and therefore knows hot and cold places. Most of the Great Plains is a prairie field, and therefore it is a dry area. B. is correct.
Region I think
Sorry if wrong
Answer:
As you increase in elevation, there is less air above you thus the pressure decreases. As the pressure decreases, air molecules spread out further (i.e. air expands) and the temperature decreases. If the humidity is at 100 percent (because it's snowing), the temperature decreases more slowly with height.
Alluvial fan could be the answer. Alluvial fans are cone shaped deposits of sedimentary particles. The particles can be sand. silt, gravel or clay. These land-forms are formed at the mouth of canyons or in valleys where ephemeral streams can occasionally transport material to the mouth of the canyons. An ephemeral stream is one that is created after a shower of rain or other form of precipitation; they are not permanent streams. <span />
