In the United States, about ____% of the forests are protected, mostly in the National Forest System managed by the U.S. Forest Service but owned jointly by the citizens of the United States.
A. 10
B. 20
C. 30
D. 40
E. 50
Answer: D
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Which area(s) on this world map is likely to have earthquakes?
A) A
B) B
C) C
D) D
E) A, B, and C only
Lakes lying in granite basins, such as those in the northeastern U.S., tend to become acidified by acid rain more readily than lakes lying in limestone basins, such as those found in the midwestern U.S. Why is this so?
A) The granite contains acidic minerals that dissolve in the rain water and are added to the lakes. B) Since the acidified water cannot percolate through the granite, the acid in the lakes becomes more concentrated. C) The limestone, which is calcium carbonate, serves to neutralize the acid in the rain. D) There is more acid rain in the northeast than in the midwestern regions of the U.S.
What two conditions must be met for a glacier to form?
What will be an ideal response?
The planet had an increase of about ________ people from 1900 to 2018.
A. 600 million B. 6 billion C. 6 million D. 60 million