Which of the following has a negative radiative forcing (i.e. cools the planet)?
A) nitrous oxides (N2O)
B) carbon dioxide (CO2)
C) Trichlorodifluoromethane (CFC-11)
D) methane (CH4 )
E) stratospheric ozone (O3)
E
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Which of the following rocks belong to Chemical Sedimentary Rocks?
a. Travertine limestone b. Dolostone c. Flint d. Evaporites e. All of the above
What is sustainable development?
- promoting a viable economy and meeting social needs at the expense of the environment - promoting a viable economy while maintaining a viable environment and meeting social needs - a purely economic pursuit, not including ethical considerations - what the United States is practicing right now
A group of concerned citizens was worried that their local water supply might be contaminated with naturally occurring arsenic. They decided to purchase a home arsenic monitoring kit and tested well water in their local area. After analyzing the data (shown below), the citizens wrote a letter to the editor of a local newspaper arguing that their data proved that the water supply is contaminated. They demanded immediate government action to address the problem. The local water board again tested the wells using their official water testing instruments and found average concentrations of 8.1 +/- 0.2 micrograms per liter. Assume the water board's reported measurements are the accepted value. The maximum permitted level of arsenic in water supplies is 10 micro-grams per liter. src="https://sciemce.com/media/4/ppg__1020817191133__f1q512g1.jpg" alt="" style="vertical-align: 0.0px;" height="119" width="470" /> What is the most reasonable action for local government to officials to take in this situation?
A. Require the water board to test a third set of well samples.
B. Test the water samples using both testing methods.
C. Require the water board to create a plan to reduce arsenic levels in the well water.
D. Ignore the data collected by the concerned citizens.
Which crop traditionally grown in the Inland South has declined during the 20th century because of increasing pest infestation?
A) Tobacco B) Corn C) Cotton D) Peaches