Which of the following is a source of dangerous indoor air pollutants in the U.S.?
A. rock deposits that emit radon gas
B. burning dung to cook dinner
C. electrical outlets that produce ozone
D. burning crop residues to stay warm
Answer: A
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A stream increases its channel slope as it moves downstream. If the water depth remains the same or decreases slightly, this stream will
A) deposit some of its sediment load due to a decrease in shear stress. B) erode additional sediment load due to an increase in shear stress. C) continue to carry the same sediment load as there is no change in shear stress. D) deposit some of its sediment load due to a increase in shear stress. E) erode additional sediment load due to an decrease in shear stress.
Colonial economies often revolved around the tertiary economic sector
Indicate whether the statement is true or false
Which of the following is an example of a numerical date?
A) The Stone Age occurred before the Iron Age. B) John Adams was president of the United States after George Washington. C) A meteorite impacted the Earth sixty-five million years ago. D) Dinosaurs descended from reptiles, which descended from amphibians.
Judge the following sentence according to the criteria given below: Oil spills in the ocean are not considered harmful BECAUSE crude oil in seawater at concentrations of 0.7 parts per billion kills or damages certain fish eggs
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct but the reason is incorrect. D) The assertion is incorrect but the reason is correct. E) Both the assertion and the reason are incorrect.