Emissions of all of the following have gone down in the last 40 years except for
A. carbon monoxide.
B. particulate matter.
C. lead.
D. sulfur dioxide.
Answer: B
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Which major physical feature in North America was created by down-cutting?
A) The Appalachian mountains B) The Erie Canal C) The Great Lakes D) The Grand Canyon
The sediments that occur on the slope, rise, and deep ocean floor and originate in the ocean are called:a
neritic sediments b. pelagic sediments c. terrigenous sediments d. well-sorted sediments
_____________________ is the name of the island shared by the Dominican Republic and Haiti
Fill in the blank(s) with the appropriate word(s).
Life is possible on Earth's surface because of the:
a. gamma rays and ultraviolet wavelengths reaching the surface. b. filtering of shortwave radiation by our atmosphere. c. action of the atmosphere as an insulator and heat transfer/storage medium. d. all of these.