Why do desert slopes tend to be steeper than slopes of humid regions?
What will be an ideal response?
Answer: Dryness and lack of vegetation makes desert slopes development much differently. The lack of water prevents soil creep which is a slope smoothing process. The lack of creep is aided by the lack of vegetation which maximizes runoff so as to minimize the soil water needed to lubricate creep.
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Different periods of the geologic time scale are different in length. Why?
A) The geologists who developed the time scale did not care about absolute ages. B) Early geologists made mistakes, but it was easier to retain the terminology in the time scale. C) The time scale was developed ad hoc, as a relative time scale based on rocks and fossil succession with no reference to absolute time when it was developed. D) None of the above
What compound do astrobiologists consider to be the most essential for the evolution of life?
A) methane, CH4 B) water, H2O C) carbon dioxide, CO2 D) oxygen, O2
Which numbered layer represents the oldest layer?
A. 1 B. 2 C. 3 D. 4
The Lewis and Clark expedition, Zebulon Pike, and Clifford Sifton encouraged settlement in the Rocky Mountain region by ________
Fill in the blank(s) with correct word