One way to maintain soil fertility is through ____.
A. soil salinization
B. waterlogging
C. slash-and-burn agriculture
D. soil conservation
E. aquaculture
Answer: D
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Some of Earth's water supply originated from
A) photosynthesis. B) icy comets. C) gases expelled from the Sun; i.e., solar wind. D) asteroids.
Older people are at increased risk for heat-related illnesses because:
A) they are more likely to have chronic medical conditions that interfere with normal heat regulation. B) they have proportionately higher metabolic heat production when compared to younger adults. C) they are often taking beta adrenergic agonists, which can lessen a tachycardic response to heat. D) they acclimatize more rapidly than younger adults, which results in faster heat production.
Geologists believe that when the thick and high part of a mountain belt becomes too high and gravitationally unstable, ________ occur(s).
A. gravitational collapse and spreading B. rapid downcutting C. volcanic eruptions D. massive landslides E. basalt flows
This pyramid shows the ratio of organisms, energy content, and biomass at different trophic levels. Suppose that a system has 5000 grasshoppers. How many hawks would be expected?
a. 5 b. 50 c. 500 d. 5000