What two elements together compose 99% of the Sun?
A. Argon and krypton
B. Carbon and oxygen
C. Hydrogen and helium
D. Uranium and plutonium
Answer: C
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Using this plot of annual peak discharge, which of the following sizes of flood is most likely to be exceeded in any given year?
A) 4,000 cubic meters per second
B) 1,000 cubic meters per second
C) 200 cubic meters per second
D) 100-year flood
Glacial deposits, as well as striated and polished bedrock, indicate that two major episodes of glaciation took place during the _______________
Fill in the blank(s) with correct word
In Morocco, all major cities such as Fez and Meknes are located along the coast
Indicate whether the statement is true or false
Lowering combustion temperatures in furnaces
A. increases emission of lead and sulfur. B. has no effect on air-pollution emissions. C. reduces particulate pollution. D. reduces production of nitrogen oxides.