In the summer, vast areas of the tundra are covered by lakes, ponds, and wetlands that are critical nesting sites for migratory birds. Which of the following best explains why this happens?
A. Permafrost prevents drainage of water.
B. Dense clay layers prevent drainage of water.
C. There is no river for the snowmelt to drain toward.
D. Continual rain keeps the land saturated.
Answer: A
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Mike stands at the edge of a cliff and throws one ball straight up and another ball straight down, both with the same speed. Neglecting air resistance, which ball hits the ground below with the greater speed?
A. The one thrown downward B. The one thrown upward C. neither, both hit with the same speed D. need more information
Which of the following is the unit of pressure most commonly found on a surface weather map?
A. inches of mercury B. atmospheres C. pounds per square inch D. hectopascals
Triassic land-plant communities were significantly different than Permian due to the introduction of
angiosperms. Indicate whether the statement is true or false.
Why is variety in crop plants important for "food security"? How is this threatened by GM food crops? What is the United States' position on GM products? How does this differ from the position of other countries?
What will be an ideal response?