In the western United States, as compared to the eastern United States, the major water problem(s) is (are)
a. Flooding
b. insufficient water for some urban areas
c. chronic drought and insufficient runoff
d. pollution of rivers, lakes, and groundwater
e. insufficient water for industry
C
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Meteorologists refer to an imaginary volume of air enclosed in a thin elastic cover as a ________.
Fill in the blank with the correct word.
Which of the following was critical for the adaptation of reptiles to terrestrial ecosystems?
a. the amniote egg b. four legs c. exoskeleton d. endoskeleton e. exoskeletons and endoskeletons
The Antarctic Treaty divides the continent into eight zones, with each of the G-8 countries responsible for one zone
a. True b. False Indicate whether the statement is true or false
Use this stream-related diagram to answer the following questions.
Predict where channel roughness is greatest.
A. Point A B. Point B C. Point C