As of 2015, what is the approximate CO2 level in Earth’s atmosphere?

a. ?100 ppm
b. ?200 ppm
c. ?400 ppm
d. ?800 ppm
e. ?1200 ppm


ANSWER: c

Environmental & Atmospheric Sciences

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Fill in the blank(s) with the appropriate word(s).

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Personal motion detection in humans takes place in the

A. nose. B. glands. C. spleen. D. ear.

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How do we know that earthquakes are the result of movement along faults?

What will be an ideal response?

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Which of the following are NOT common in braided streams?

a. point bars b. clay plugs c. meander scrolls d. all of the above

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