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
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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
Crustacean zooplankton include the following groups except ________.
A. copepods B. krill C. chaetognaths D. euphausids E. None of these is a crustacean.
Geography is concerned with _______, the exact placement of locations on the face of the Earth
Fill in the blank(s) with correct word
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