What is ozone?

A. a gas that blocks ultraviolet radiation from reaching Earth
B. a gas that resides in the stratosphere
C. a gas consisting of molecules containing three oxygen atoms
D. all of the above


Answer: D

Environmental & Atmospheric Sciences

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Since the formation of our ocean, Earth has made approximately ____ orbits around the galaxy

a. 20 b. 42 c. 230 d. 280

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Crustacean zooplankton include the following groups except ________.

A. copepods B. krill C. chaetognaths D. euphausids E. None of these is a crustacean.

Environmental & Atmospheric Sciences

The higher the ratio of oxygen-18 to oxygen-16 in the shells of organisms that lived in the sea during the geologic past, the ____ the climate at that time

a. ?colder b. ?warmer c. ?wetter d. ?drier e. ?more humid

Environmental & Atmospheric Sciences

Geography is concerned with _______, the exact placement of locations on the face of the Earth

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences