Soils in the eastern part of the U.S. tend to be alkaline and soils in the West tend to be acidic
Indicate whether the statement is true or false
F
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A wave first begins to break against the shore when the ratio of wave height to water depth is about 1:2
Indicate whether the statement is true or false
Carbon monoxide ________
A) is a major component of the atmosphere B) is consumed by plants for photosynthesis C) causes ozone depletion D) is produced by plants during photosynthesis E) blocks oxygen transport in human blood
Which of the following is true?
A) Lightning results from the buildup of electrical-energy polarity within clouds. B) Thunder is caused by rapid cooling of the air. C) Thunder is caused by rapid contraction of the air. D) Lightning is relatively uncommon on the Earth.
Currently, the number of years required for the world's population to double is approximately:
A. 53 years B. 73 years C. 43 years D. 13 years E. 93 years