The El Nino event of 1972–1973, one of the first to be studied in depth, reduced the annual Peruvian anchovy catch by more than ____ percent.?
a. ?10
b. ?20
c. ?30
d. ?40
e. ?50
ANSWER: e
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Read carefully through the following sentence, and decide which of the options is correct. Most mountain belts form near convergent plate boundaries where crust thickens by tensional shortening and by intrusion and crystallization of magma
A) The word "tensional" should be replaced by "compressional." B) The word "convergent " should be replaced by "divergent." C) The word "near" should be replaced by "far from." D) The word "crust" should be replaced by "mantle."
Could a single graphic scale be used to measure distances on a Mercator projection? Explain.
Compare the Mercator projection to a globe.
Which of the following is true?
A) Decreasing the activation energy decreases the reaction rate. B) Decreasing the activation energy increases the reaction rate. C) The activation energy of an exothermic reaction is negative. D) There is no relationship between activation energy and reaction rate.
Aside from getting enough calories, we also need to obtain ________ through our diet.
A. a complete carbohydrate B. minerals C. vitamins D. both B and C