Explain the formation of sand dunes
What will be an ideal response?
As saltating sand grains encounter small patches of sand, their kinetic energy is dissipated and they accumulate. As the accumulations continues to develop, increasing to heights above 30 cm (12 in), a slipface and characteristic dune features form.
Dunes are typically asymmetrical in or or more directions. Winds characteristically create a gently sloping windward (stoss) side and a steeper slipface on the leeward side. The angle of the slipface is the steepest angle at which loose material is stable (i.e. the angle of repose).
Dunes are generally classified according to three general shapes: crescentic, linear, and star.
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Which of the following names is commonly used to describe the drier region on the downwind (leeward) side of a mountain range?
A. rain shadow B. inversion region C. compression region D. orographic
Wegener's continental drift theory, proposed in 1912, was widely accepted by scientists of the day
a. True b. False
To whom might globalization represent a threat? Name a group and explain why
What will be an ideal response?
Peasant landholdings in the Soviet Union were confiscated and reorganized under the _____ agricultural system
a. orthodox b. apostolic c. indoctrinate d. collectivized e. consolidated