The presumed causes for transgressions and regressions of shallow seas during the Paleozoic
were
a. greenhouse effect and glaciation.
b. tectonic activity and continental rifting.
c. glaciation and tectonic events.
d. bolide impact and glaciation.
e. none of the above
C
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Which of the following is in proper historical sequence?
A) subsistence agriculture, commercial agriculture, hunting and gathering B) hunting and gathering, subsistence agriculture, commercial agriculture C) hunting and gathering, commercial agriculture, subsistence agriculture D) commercial agriculture, subsistence agriculture, hunting and gathering
The term ________ refers to a city's adjacent milk-producing region; cities everywhere, not just in the Dairy Belt, have them
A) dairy city B) cow country C) udder suburbs D) milkshed
A temperature inversion is necessary for the creation of an inferior mirage
Indicate whether the statement is true or false
Thermal pollution results primarily from
A. power generation. B. heating. C. manufacturing. D. irrigation.