If extremely cold fresh water is added on top of seawater, ________.
A. the cold water will float at the surface
B. the wind will control the surface mixing
C. the cold water will sink to the bottom and stagnate
D. an overturn will begin immediately
E. the cold water will sink and move rapidly out of the area
Answer: A
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The Greenhouse gas with the greatest greenhouse potential is ________.
A. CFC-11 B. Methane C. CFC-12 D. Ozone E. Carbon dioxide
Only Africa has countries with greater than 20% prevalence of undernourishment
Indicate whether the statement is true or false
Dehydration of which type of alcohol can never result in a mixture of products?
A) 1° B) 2° C) 3° D) None, mixtures can be obtained from any of these.
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__f1q510g1.jpg" alt="" style="vertical-align: 0.0px;" height="119" width="470" /> Which of the earth-system scientist's roles is best illustrated by this paragraph?
A. Informing society
B. Use of earth resources
C. Alerting the public of natural hazards
D. Health of the environment