A bold hypothesis put forth in 1960 was that of _____.
A ) continental drift
B ) seafloor spreading
C ) thermal vents
D ) planetary accretion
B ) seafloor spreading
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Compared to the mass of an apple on the Earth's surface, on the Moon's surface
A. it is less. B. it is more. C. it is the same. D. a mystery.
Ecology is the study of how:
a. Atoms make up the environment. b. Humans affect the environment. c. Organisms interact with each other and their nonliving environment. d. Energy runs the environment. e. Evolution affects nature.
The frequency of a phenomenon over a given study area is defined as ________
Fill in the blank(s) with the appropriate word(s).
Cases of premature aging of the skin and cataracts have risen due to increased
A) levels of sulfur dioxide in the atmosphere. B) levels of carbon monoxide in the atmosphere. C) exposure to ultraviolet light. D) exposure to infrared radiation from the sun.