What is a flood?
A) When dry weather results in a high discharge
B) When discharge in a river exceeds the river's capacity
C) When a dam is constructed and forces sedimentation
D) When changes in gradient result in the abandonment of meander loops
Answer: B
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Hydrocarbons
A) typically contain other elements besides carbon and hydrogen. B) occur only in particulate forms. C) are released into the atmosphere primarily through natural processes. D) cause substantial health problems in cities with high levels of air pollution.
The global temperature pattern observed between 1880 and 2000
A) reflects the results of the destruction of the ozone layer. B) suggests that mitigation of carbon dioxide is urgently needed. C) reveals a year-by-year increase in temperature every year since 1980. D) shows no clear trend in temperature change for more than 120 years.
If grass stores 1,000 energy units received from the sun, the ecological efficiency of the ecosystem is 10%, and the trophic levels are grass ? cow ? human, how many units of energy does the human receive of the original 1,000 units?
A. 900 B. 200 C. 100 D. 10 E. 1
Geostrophic wind always flows ________
A) parallel to the isobars B) to the left of the original wind direction C) counterclockwise D) slowly E) along the surface of the Earth