The largest contributing factor for the current high rate of animal extinctions is
A. Drought conditions caused by the greenhouse effect
B. Commercial harvesting of wildlife in Africa
C. Uncontrolled sport hunting in the developed world
D. Habitat destruction worldwide
E. None of these by themselves cause high rates of animal extinctions, but together they combine to cause high rates
Answer: D
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Large river systems that have multiple large channels across a vast floodplain are termed
A) anabranching rivers. B) braided streams. C) meandering streams. D) steep-walled channels.
The Coriolis effect occurs because of this characteristic of the earth:
A) its dense core. B) its rotation. C) its magnetic field. D) its atmosphere.
In the mid-twentieth century, researchers dredging the seafloor could not find any materials older than ________
A) 10,000 years B) 1.2 million years C) 180 million years D) 1.5 billion years
The force that results from a difference in atmospheric pressure between two locations is called ________.
Fill in the blank(s) with the appropriate word(s).