In Los Angeles, photochemical smog
A) is relatively uniform throughout the metropolitan area.
B) is relatively constant throughout the day and night.
C) varies throughout the day and night.
D) varies throughout the day and night and is relatively uniform throughout the metropolitan area.
Answer: C
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Compared to climate changes due to plate tectonics and astronomical causes, the changes due to volcanic eruptions are:
A) longer. B) of equal duration. C) very short. D) much larger.
Efforts are under way to make charcoal out of fibers left over from processing sugar cane.
Answer the following statement true (T) or false (F)
Although extremely cold, the polar climates still receive more energy from the sun than they lose during the year
Indicate whether the statement is true or false
The concentration of ____________________ is close to 21 percent (by volume) in the upper stratosphere (the same concentration as in the trophosphere), but without proper breathing apparatus you would not be able to survive there
Fill in the blank with correct word.