Cloud-to-ground lightning begins within the cloud when the localized electric potential gradient exceeds ____ volts per meter along a path perhaps 50 m long
a. 300
b. 3,000
c. 30,000
d. 300,000
e. 3 million
ANSWER: e
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What is particularly troublesome about the practice of mountaintop removal for mining coal in the mountains of West Virginia?
A. Dumping of waste rock in the surrounding valleys B. Land subsidence C. Cave-ins D. Gas explosions
Which of the following statements best illustrates bias in scientific investigations?
A) Investigations of the cause of AIDS are limited by our inability to see viruses. B) Investigations of the health effects of smoking are funded and published by a tobacco company. C) An experiment testing the effect of a new drug has only one control group. D) Researchers studying heron nests notice that some baby herons fall out of nests and are killed.
Briefly describe how mountain belts such as the Himalayas form
What will be an ideal response?
The Coriolis effect is caused by the
A. Seasonal changes in air temperature and humidity B. Heating and cooling of air masses C. Rotation of the Earth D. Jet stream E. Movement of tectonic plates