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 />
I would say false, the goal of Wildlife refuges is to protect and grow the population or number of animals of a species. Endangerment is threatening lives of many species every day, the goals of refuges is to protect these animals and provide a safe and healthy environment. Not to keep humans completely away from them, to False.
B. plate tectonics your welcome
