Placer mining involves washing metals, minerals, and the gemstones from streambeds with a water cannon.
Answer the following statement true (T) or false (F)
True
Environmental & Atmospheric Sciences
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The primary effect of thermal pollution on aquatic ecosystems is ________
A) lowering the pH of the water B) causing a large increase in plant productivity C) depleting dissolved oxygen D) increased evaporation E) lowering the water table
Environmental & Atmospheric Sciences
A pound of which of the following would have the highest energy content?
A) Gasoline B) Coal C) Lightbulbs D) Wood
Environmental & Atmospheric Sciences
This North American country has an average population density of around 85
a. United States b. Canada c. Greenland d. Mexico
Environmental & Atmospheric Sciences
Scrubbers are being used in the U.S. to reduce sulfur dioxide emissions associated with the burning of fossil fuels.
Answer the following statement true (T) or false (F)
Environmental & Atmospheric Sciences