Which of the following is least likely to reduce soil fertility?
A) weathering
B) agricultural use and harvest
C) a fallow period with no plant growth
D) the dissolution of minerals
Answer: A
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Scientists recognize three levels of extinction. Identify and briefly explain each of these. How seriously does each of the levels affect the earth's biodiversity?
What will be an ideal response?
As water changes states from liquid to vapor, energy is absorbed
Indicate whether the statement is true or false
Based on your knowledge of the relationship between photosynthesis, respiration, and carbon dioxide, which of the following region and date combinations exhibits the most unexpected CO2 readings?
A) High values over Serbia during January B) Low values over eastern Russia during July C) High values over Paraguay during July D) Low values over Argentina during January E) High values over the southeastern United States during July
The trickling-filter system and the activated-sludge systems in wastewater treatment both require
a. the addition of large amounts of chlorine to kill pathogens. b. the addition of large amounts of ammonia as nutrients to support decomposers. c. high levels of oxygen to promote aerobic decomposition. d. high levels of carbon dioxide to adjust the pH of the water for bacterial action.