Which zone of the ocean may have some fish and crustaceans that are blind or have their own light sources?
A. oligotrophic.
B. continental.
C. bathyal.
D. euphotic.
E. abyssal.
Answer: E
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Suppose the outflow of air around a surface high-pressure area is greater than the convergence of air aloft. Which of the following conditions would be observed?
A. decrease in the central pressure B. increase in pressure in the centre of the high C. movement of the high toward the northeast D. strengthening in the high
A prairie was covered by grasses and wildflowers. A farmer removed this native vegetation so he could plow the land and plant crops. For years, normal rain fell and the farm thrived. But after a few years of drought, the crops died and the topsoil on the farm eroded. Explain how the farmer's use of the land led to the erosion that occurred there.
What will be an ideal response?
Which of the following does moment magnitude measure or estimate?
A) the amplitude of the largest seismic wave recorded on a seismogram B) the total energy released during an earthquake C) the total damage to an area D) difference in magnitude between P and S waves
Which of these actions can we take to reduce desertification?
A. increase irrigation B. increase grazing C. manipulate weather to control drought D. decrease number of trees in desertified areas E. decrease human contribution to climate change