What usually causes a downstream flood?
A. Localized accumulations of water upstream
B. Very rapid deltaic sedimentation
C. Storm surge during high tide
D. Regional accumulations of water upstream
Answer: D
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When coal is burned to generate electricity, 70% of the primary energy in the coal is transformed into unused heat. This means that the energy conversion efficiency from chemical to electrical energy is ________
A) 70% B) 30% C) 0% D) 100% E) cannot be determined
Trilobites were dominant during which geologic period?
A) Jurassic B) Permian C) Devonian D) Ordovician E) Cambrian
The use of hydrogen gas would eliminate most of the air pollution problems we have today because:
a. When it burns it combines with carbon dioxide and removes it from the air. b. When it burns it combines with water to produce heavy rainwater. c. When it burns it combines with oxygen gas in the air to produce water vapor. d. When it burns it combines with carbon to produce methane gas. e. More than one of the answers is correct.
Identify the human activities that negatively impact the phosphorus cycle, and explain their impacts
What will be an ideal response?