Natural levees are constructed of machine-compacted sand and mud; artificial levees are made of concrete.

a. true
b. false


Ans: b. false

Environmental & Atmospheric Sciences

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The European wild boar is considered an invasive species because it

A. competes for food with native endangered species. B. causes traffic accidents. C. provides game. D. controls pest populations of the Argentina fire ant. E. is a variety of the feral pig.

Environmental & Atmospheric Sciences

The average number of children born to women in a population during their reproductive years is the

a. crude birth rate b. total birth rate c. total fertility rate d. crude fertility rate e. population's natural rate of increase

Environmental & Atmospheric Sciences

Crude birth rates rise in Stage Three of the demographic transition as a result of economic growth, urbanization, rising standards of living, and education

Indicate whether the statement is true or false.

Environmental & Atmospheric Sciences

One widely used method for desalinating water is ____.

A. activated carbon filtration B. subsidence C. transpiration D. reverse osmosis E. treadle pumping

Environmental & Atmospheric Sciences