Which atmospheric phenomenon below is produced by the diffraction of light around small water droplets?
a. ?halo
b. ?inferior mirage
c. ?corona
d. ?Heiligenschein
e. ?sun pillar
ANSWER: c
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A lion is an example of a heterotrophic organism. Indicate whether the statement is true or false
Which of the following is not true of UV exposure?
A) UVA radiation is not filtered by the ozone layer and amounts for about 95% of all UV radiation reaching the Earth's surface. B) Only exposure to UVA is a concern, not exposure to UVB and UVC. C) UV radiation is potentially harmful and individuals should take appropriate precautions depending on the UV index. D) UV radiation varies spatially according to the season, local weather conditions, and overhead ozone depletion.
An increase in stream velocity can be caused by _____
a. an increase in stream gradient b. an increase in channel roughness c. a decrease in stream competence d. a decrease in stream capacity e. a decrease in stream energy
If the load exceeds a stream's capacity, sediment accumulates in the bed in a process called
A) saltation. B) aggradation. C) degradation. D) downcutting.