Harry Hess proposed the theory of seafloor spreading—the creation of new oceanic crust at mid-ocean ridges
a. True
b. False
True
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Backyard shops, street hawkers, and providers of simple services on street corners constitute the
A) workforce. B) informal sector. C) tax base. D) basic economy.
What percent of tallgrass prairie in the United States has been transformed into farmland and other uses?
A. 79% B. 99% C. 5% D. 55%
Which of the following is the correct definition of stream gradient?
A) the distance traveled by water in a channel times a drop in elevation B) the increase in discharge of a stream per unit drop in elevation C) the drop in elevation of a stream divided by the distance the water travels D) the water pressure at the bottom of the stream divided by the stream's width
The only indication on the station model of past weather conditions is the
a. ?temperature. b. ?dew point. c. ?cloud cover. d. ?wind direction. e. ?pressure tendency.