Which is the reason for the land subsidence in the San Joaquin Valley in California?
A. agriculture
B. earthquakes
C. compaction by heavy machinery
D. power generation
Answer: A
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Why is wind less effective than moving water at picking up and moving materials?
A) Air does not move very far B) Air is less dense than water C) Air moves faster than water D) Air moves slower than water
From Kepler's ________ law, we conclude that the planets do not move with constant speed.
A. First B. Second C. Third
What conditions are necessary to maintain an ocean of liquid water permanently? Why is having a
liquid ocean so important? What will be an ideal response?
Fossil evidence indicates that complex life forms, capable of generating easily fossilized hard parts like shells or bones, have existed in abundance on Earth since approximately ________ years ago.
A. 5,440 B. 544 thousand C. 544 million D. 5,440,000,000 E. 544,000,000,000