What caused the debris avalanche from Mount St. Helens in 1980?
A) rainfall
B) earthquake
C) volcanic eruption
D) magma intrusion
Answer: D
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The El Niño begins to weaken and eventually terminates when
A) the leading edge of the cold Kelvin wave finally reaches the eastern coast of South America. B) cold water spreads out away from the equator, bringing warm upwelling waters from depth. C) cold water converges on the equator, bringing cold upwelling waters from depth. D) warm water spreads out away from the equator, bringing cold upwelling waters from depth.
If a sediment is white in color, it is likely to be:
a. undergoing oxidation. b. terrigenous in origin. c. biological in origin. d. a nodular sediment
Which of the following is not a real compound?
A) 1-hydroxybutanoic acid B) 2-hydroxybutanoic acid C) 3-hydroxybutanoic acid D) None, they are all real compounds.
Radioactive materials can be made nonradioactive by heating and treating by chemical reaction.
Answer the following statement true (T) or false (F)