How has conventional agriculture altered N and P cycles? What are the consequences beyond agroecosystems?
What will be an ideal response?
Answer: Large quantities of atmospheric nitrogen are fixed through industrial processes and added to the soil in inorganic fertilizer. This results in runoff of ammonium and nitrate into rivers and streams which in turn encourage algal growth and eutrophication. Phosphorous is also used as a fertilizer, it runs off into lakes and streams and causes eutrophication.
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Regions where humans produce high levels of aerosols and dust will most likely experience
A) less rainfall, reduced solar radiation to the Earth's surface, and cooler temperatures. B) less rainfall, increased solar radiation to the Earth's surface, and higher temperatures. C) more rainfall, increased soil nutrients, and reduced solar radiation to the Earth's surface. D) more rainfall, decreased soil nutrients, and increased solar radiation to the Earth's surface.
How many half-lives are required to yield a mineral with 2,000 atoms of parent isotope and 30,000 atoms of daughter isotope? If the half-life of the parent-daughter isotope pair is 1.0 billion years, how old is the rock? Please show your work
What will be an ideal response?
A ____ is an organism, such as a mosquito, that transmits a disease-causing organism to a host.
a. virus b. fungus c. bacterium d. vector
What is an adverse environmental impact of the mountaintop removal method of coal mining?
A. Subsidence and collapse of the ground B. Increasing input of carbon dioxide to the atmosphere C. Acid mine drainage D. Permanently altered streams and ecosystems