During the Grenville orogeny, an ocean basin along the eastern margin of North America was closed
a. True
b. False
True
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Observe where the sun is overhead for most of the year in the Tropics. Temperatures are most constant along the
A) Arctic Circle.
B) Tropic of Cancer.
C) Equator.
D) Tropic of Capricorn.
E) Antarctic Circle.
What is a region in the atmosphere where air temperature remains constant with height?
A) temperature inversion B) jet stream C) isothermal zone D) hypoxic zone
When the EPA began risk assessment in the mid-1970s, it was primarily concerned with
A) the safety of public transportation systems.
B) interactions between people and wildlife in national parks.
C) cancer risks associated with pesticides and toxic chemicals.
D) accidents associated with lost time on the job and workers' compensation.
Which crop traditionally grown in the Inland South has declined during the 20th century because of increasing pest infestation?
A) Tobacco B) Corn C) Cotton D) Peaches