Approximately how many genes were believed to be in the human genome prior to 2000?
A) 10,000
B) 30,000
C) 100,000
D) 1,000,000
C
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What explains why the soil property known as shrink-swell is important in environmental geology?
A. greatly enhances the effect of agricultural droughts B. causes structural damage in buildings C. causes soils to become less permeable D. prevents farmers from working their fields E. causes soils to become unstable on steep slopes
An artesian well occurs when ________
A) granite is overlain by a sandy substrate, allowing percolation into the aquifer B) there are several aquifers that have merged C) a water-bearing, porous layer of rock, sand, or gravel has accumulated groundwater over a long period of time D) an aquifer is trapped under pressure between two layers that are less permeable E) a well is dug through layers of sand and gravel into the water table
Which of the following locations contains modern coral reefs?
A. Philippines B. Bahamas C. Polynesia D. All of these locations contain modern coral reefs.
The mass extinction in the geologic record, which proved to be the most devastating to life on Earth, occurred at the
end of the ____. a. Cambrian b. Cretaceous c. Devonian d. Ordovician e. Permian