What is the east-moving belt of wind that circles the globe at subtropical latitudes?
A. trade wind
B. jet stream
C. geotrophic wind
Answer: B
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Why might there be density changes between different parts of the same layer of the planet?
A) Different materials make up different regions of the same layer. B) Some materials may compress when squeezed by overlying rock. C) Repelling forces may cause some atoms to expand. D) Differentiation is still separating materials into distinct interior layers.
Another name for the subtropical high is:
A) subpolar calm. B) trades. C) doldrums. D) prevailing westerlies. E) horse latitudes.
Environmental science is the study of earth's natural hazards.
Indicate whether the statement is true or false.
In 1991, scientist James Estes and his team observed a new trend of orcas preying on sea otters. Orcas normally prey on great whales, but those populations had been dramatically reduced by industrial whaling. Estes hypothesized that the decrease in the great whale population had caused orcas to turn to smaller prey -- sea otters. If this hypothesis is correct, predict what might happen to sea otter numbers if great whale population numbers increase.
a. Sea otter populations would decrease. b. Sea otter populations would increase. c. Sea otter populations would stay the same. d. There is not enough information.