What is permafrost, and what problems are associated with construction in a permafrost environment? What will be an ideal response?
Permafrost is ground that remains permanently frozen. Heat from an insulated building will escape
through the floor, thaw the ground below, and turn it into a soggy mush. The building then settles
unevenly into the ground and numerous structural problems result.
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What is a neutralizing antibody?
A) an antibody which affects the electrical charge of the antigen B) an antibody which affects the pH of the antigen C) an antibody which completely eliminates the antigen D) none of the above
Which represents the amount of rivers in the world that are heavily polluted?
A. 1/2 B. 1/4 C. 3/4 D. All
As oceans become more acidic, the shells of tiny sea snails tend to dissolve. This is a concern because:
a. The snail shells provide material for jewelry making on south sea islands. b. The shells are ground up and used for fertilizer for agricultural crops. c. The snails are the base of a food web that supports entire polar ecosystems. d. More than one of these are correct. e. None of these answers.
The greenhouse effect refers to
A. a natural phenomenon that keeps the earth's atmosphere warm. B. albedo. C. environmental change. D. the gradual warming of the earth due to anthropogenic causes.