Desertification in the Sahel region occurred in large part because of a positive feedback mechanism involving the descending branch of the Hadley cell
Indicate whether the statement is true or false
True
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How does a crevasse form?
A) A glacier moves over a volcanic hot spot, causing differential melting and caving it inward. B) A glacier moves across a ridge of particularly resistant rock, which breaks the glacier from the bottom upward. C) Internal stress causes a glacier's upper surface to break as the glacier moves. D) A glacier moves over a pre-existing stream valley, which causes it to fracture on each side of the valley.
The matter and energy laws tell us that we can recycle ____.
A. both matter and energy B. neither matter nor energy C. matter but not energy D. energy but not matter E. nothing and everything
Which of the following is true when HCl(g) dissolves in water?
A) The HCl(g) reacts with the water. B) The solution is a strong electrolyte. C) both a and b D) neither a nor b
At present (2016) growth rates, the doubling time of the world's population is about 70 years.
Answer the following statement true (T) or false (F)