A stream becomes graded when
A) its basin becomes rejuvenated.
B) a local base level controls the stream.
C) a river achieves a longitudinal stream profile of a steeper upstream portion.
D) erosion and deposition are in equilibrium.
D
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Even though rises in sea level during this century may result in millions of Bangladeshi environmental refugees, the government of Bangladesh is not preparing for this possibility.
Answer the following statement true (T) or false (F)
Colony collapse disorder is ____.
A. limited to Europe B. limited to the United States C. when honey bees leave in winter and don't return to their hives in spring D. the disintegration of bee hives E. experienced by members of the bee colony after the queen's death
Chestnut blight fungus kills U.S. chestnut trees because the trees ________
A) release the fungus in the leaves that fall to the ground and the fungus is absorbed in the soil B) have not matured long enough to survive C) release the fungus into the soil and it is drawn up in the roots D) have not coevolved with the fungus E) are hosts to the vectors of the fungus
Which of the following is a secondary air pollutant?
A) radon B) sulfur dioxide C) ozone D) nitrogen oxide E) carbon monoxide