The concentration of steel production in Pittsburgh was made possible by

A. the abundance of coal in Pennsylvania.
B. the abundance of coal in Georgia and Alabama.
C. the confluence of the Allegheny and Monongahela Rivers.
D. the density of population in the mid-Atlantic states.


A. the abundance of coal in Pennsylvania.

Environmental & Atmospheric Sciences

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All of the following are typical effects of dam construction except

A) interruption of the normal seasonal variation in flows of water. B) increased amount of sediment carried downstream of the dam. C) disruption of natural ecosystems. D) protecting towns from flooding.

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What layer is permanently devoid of light?

A) Photic zone B) Euphotic zone C) Disphotic zone D) Aphotic zone

Environmental & Atmospheric Sciences

________ carried out research to determine the impact of zebra mussels on fish communities

A) David Strayer B) Charles Darwin C) Native Americans D) S.W. Breckle E) Aldo Leopold

Environmental & Atmospheric Sciences

Freshwater runoff can reduce salinity

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences