What extraction process involves setting off explosive charges to create cracks deep in rock and then pumping a mixture of water, sand, and chemicals into the cracks?

A. liquid extraction
B. solar conversion
C. vertical drilling
D. hydraulic fracturing
E. horizontal drilling


Answer: D

Environmental & Atmospheric Sciences

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No evidence of life has been found in the Precambrian.

a. true b. false

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Indicate whether the statement is true or false

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Which of the following statements about pH is true?

A) The pH scale measures the concentration of hydrogen ions in a solution. B) A pH of 3 is alkaline, a pH of 10 is acid. C) An acid is a substance that combines with a hydrogen in solution. D) On average, the pH of the ocean is moderately acidic.

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