What percentage of its energy needs does the United States import each year?
A) more than 90 percent
B) about 70 percent
C) about 50 percent
D) about 33 percent
E) about 20 percent
Answer: C
You might also like to view...
The carbohydrates found in the cell membrane function in
A. cell recognition, the ability to distinguish one type of cell from another. B. controlling the chemical reactions that occur in cells. C. controlling transport in and out of cells. D. none of the above
The relative direction and average rate of plate movement can be calculated using ____
a. accreted ophiolite studies b. hot spots c. subduction rate measurements d. magnetic anomalies and satellite-laser ranging e. spreading ridges
Since the Industrial Revolution, climate change data shows that ________
A) glacial regions are decreasing while forestry areas are expanding B) rainfall has increased significantly in eastern North and South America C) rainfall has decreased significantly in North America and Europe D) desert and glacial regions are increasing E) glacial regions are increasing while more forestry areas are expanding
Which of the following is not an example of a disturbance in an ecosystem?
A. Shade B. Flash flood C. Fire D. Drought