Homework 5 Questions
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Near the equator, the patterns of convection currents are called ________.
Hadley cells
Humans use more fresh water for ________ than for any other purpose.
agriculture
A watershed is ________.
The area of land that drains into a river or lake
The rapid melting of Greenland’s ice cap could disrupt the NADW formation by ________
adding huge amounts of less-dense fresh water to the surface of the system
________ are substances that cause birth defects
Teratogens
One of the problems that occur as a consequence of CFC pollution is ________.
increased rates of skin cancer in humans
Which of the following is a secondary air pollutant?
ozone
Acute exposure to an environmental toxin ________.
is a high exposure over short times and associated with a specific causeis a high exposure over short times and associated with a specific cause
Weather occurs in the ________.
troposphere
Assume that the scales for graphs (a) and (b) are identical. Compare the graphs. Which of the following statements is true? (PICTURE INCLUDED)
The toxicant shown in (b) has a lower toxicity than the toxicant shown in (a).
Most of Earth’s liquid fresh water is found ________.
underground
The fish in the lake at the local park are dying, and a professor from the local college comes to investigate. First, she measures the levels of dissolved oxygen in order to check for ________.
hypoxia
Synergistic effects of toxicants ________.
are greater than the sum of the effects of the components
Water bodies where rivers flow into the oceans, mixing fresh water with saltwater, are called
estuaries
In the United States, which of the following has decreased since 1980?
air pollution emissions