The molecules of a gas at room temperature move at about
A) 1 km/hr. 0.27 m/s.
B) 10 km/hr. 2.7 m/s.
C) 150 km/hr. 40.5 m/s.
D) 500 m/s.
D
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Shrinking industrial cities have
A) too much 'shock'. B) no 'buzz'. C) too much urbanism. D) violated the rank-size rule. E) spatial inequality.
Nitrogen fixation occurs by both natural and human processes
Indicate whether the statement is true or false.
Which process forms a'a lava formations?
A) Very thick lava squeezes out in large mounds. B) Thin lava runs quickly over a large area. C) Lava stops flowing while it is still hot and forms ropes. D) Lava continues flowing after a crust forms.
Which of the following best describes human population growth from early times to the present day?
A) early rapid growth which has leveled off to a nearly constant rate in the last 20 years B) rapid, explosive growth throughout the period C) early rapid growth which has increased rapidly in the last 20 years D) slow, uneven growth until the 1800s, then rapid growth E) slow, steady growth throughout the period