Explain how soil biota can be killed by human actions and some of the effects
What will be an ideal response?
Human activities that result in erosion, salinization, acid rain, and water logging can cause a loss of soil microorganisms. In recent years, humans have begun to use nanoparticles (small beads of silver) in different products. Their purpose is as an antimicrobial agent. When nanoparticles reach the soil, they can kill natural and beneficial microorganisms that help to maintain soil health.
"Soil microbes help plants germinate, obtain nutrients, and perform other activities." Therefore, when the soil biota are affected, the soil health is also affected.
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Which of the following methods of producing electricity have the lowest net energy ratios?
a. nuclear power and photovoltaics b. nuclear and wind power c. wind power and coal d. coal and hydroelectric e. nuclear and coal
Which biome is characterized by the greatest amount of annual rainfall and primary productivity?
A) Temperate deciduous forests B) Temperate grasslands and prairies C) Tropical rain forests D) Tropical grasslands and prairies
Which plate lies between the South American and Pacific plates?
A. Nazca B. Juan de Fuca C. Indian-Australian D. North American
Which of the following is a group of people with a common culture occupying a particular territory, bound together by a strong sense of unity?
A. state B. federation C. nation D. enclave