To be an artesian spring, a spring must _____
a. contain salt water
b. flow upward to a level above the local water table
c. lie below a cone of depression
d. flow for only part of the year
e. have been drilled or dug by people
b
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The atmosphere is divided vertically into four layers on the basis of temperature. List and describe these layers in order, from lowest to highest. In which layer does practically all of our weather occur?
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Approximately how many different proteins are found in a typical cell?
A) 900 B) 9000 C) 100,000 D) 1,000,000
Approximately ________ million years ago, the Earth began to have an oxygen rich atmosphere.
A. 359 B. 444 C. 250 D. 2500