Which of the following caused devastating effects on the marine food chain and was banned in the United States in 1972?
A) DDT
B) Methyl mercury
C) PCBs
D) Polycyclic aromatic hydrocarbons
E) Sewage sludge
A
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Which of the following is not an expected result of rising sea levels?
A) rising islands B) flooding along inland stream banks C) undrinkable ground water in wells in coastal areas D) landward migration of barrier islands
Once salt is dissolved in water the:
A. positively charged sodium cation is surrounded by the negative side of encircling water molecules. B. negatively charged sodium cation is surrounded by the negative side of encircling water molecules. C. positively charged chlorine cation is surrounded by the positive side of encircling water molecules. D. positively charged sodium cation is surrounded by the positive side of encircling water molecules.
The ____ marks the location where the westerlies and polar easterlies meet
a. U.S.-Canadian border b. polar front c. middle latitude convergence zone d. Icelandic front
Among plankton, animals that drift on ocean currents are specifically known as ________
Fill in the blank(s) with correct word