The Precambrian represents approximately 88 percent of geologic time
a. True
b. False
True
Environmental & Atmospheric Sciences
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Organic evolution is predictive, supported by a multitude of evidence, and offers a good explanation of observed
phenomena. Organic evolution, therefore, is considered a ____. a. hypothesis b. law c. theory d. unifying concept e. working model
Environmental & Atmospheric Sciences
The most recent warming trend experienced over the Northern Hemisphere could be the result of ____
A) light colored particles in the stratosphere B) increasing levels of greenhouse gases C) a decrease in the energy emitted by the sun D) an observed decrease in snow cover
Environmental & Atmospheric Sciences
The amount of water vapor in the air (by volume) usually does not exceed ________
50% 28% 14% 4%
Environmental & Atmospheric Sciences
Under permanent agriculture, the fertility of land is always impaired
Indicate whether the statement is true or false
Environmental & Atmospheric Sciences