Which of the following best describes the Freeze Separation Method for desalination?
A) A current is run through positive and negative electrodes in freshwater separated by semipermeable membranes from seawater.
B) Large icebergs are brought to coastal waters off countries that need freshwater where they are melted.
C) Saltwater is boiled and the water vapor is passed through a cooling condenser, where it condenses as freshwater.
D) Seawater is frozen and thawed multiple times, with the salts washed from the ice between each thawing.
E) Water on the salty side of a semipermeable membrane is pushed under high pressure through the membrane to the freshwater side.
D
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Describe the general width and shape (cross section) of the valley floors of first-order streams in the Eds Creek drainage basin.
What will be an ideal response?
Nitrogen dioxide (NO2 ) reacts with ____ in the atmosphere to form nitric acid (HNO3 )
A) hydrogen B) water vapor C) ozone D) carbon dioxide
What are the so-called greenhouse gases that trap heat?
a) carbon dioxide, methane, nitrous oxide, ozone, chlorofluorocarbons b) oxygen, water vapor, black carbon, carbon dioxide c) hydrogen, nitrogen, sulfur dioxide, oxygen d) carbon dioxide, methane, oxygen, ozone e) ozone, smog, nitrous oxide, aerosols
You have read about the mistakes made on Easter Island. On Tikopia, a small island in the Solomon Islands, the people acted in other ways. When they realized that the pigs they had imported were damaging the environment, they killed them all. They had to
have permission from a chief to fish, which prevented overfishing. They also practiced contraception. These actions all indicate that ________. A) they were concerned with only one year at a time B) they felt that everything was a nonrenewable resource C) they felt that everything was a renewable resource D) they were attempting to enact sustainability E) they believed in full resource utilization