Barchans ____

a. are a type of longitudinal dune
b. have slip faces oriented parallel to the average wind direction
c. have arms that point downwind
d. are typically stabilized by vegetation


c

Environmental & Atmospheric Sciences

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The world's largest urban areas are generally called "metropolises."

Indicate whether the statement is true or false.

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Explain the difference between GIS and GPS

What will be an ideal response?

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What percentage of the sub-Saharan African population is urban?

A) 18% B) 20% C) 27% D) 37% E) 41%

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