Stabilized sand dunes:
a. have only been found on Mars.
b. are protected from erosion by a surface salt crust.
c. are protected from erosion by a surface clay pan.
d. are anchored by yardangs.
e. are anchored by vegetation.
E
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Water vapor cannot condense onto hygroscopic nuclei particles at relative humidities less than 100 percent
a. True b. False
The largest source of anthropogenic greenhouse gases in the United States is ________
A) nuclear power plants B) tropical deforestation C) transportation D) agriculture E) electricity generation
The region of the U.S. that uses the most water for irrigation is
A. the northwestern states (west of the Mississippi River and north of 40°N latitude). B. the northeastern states (east of the Mississippi River and north of the Ohio River). C. the southwestern states including southern California (west of the Mississippi River and south of 40°N latitude). D. the southeastern states (east of the Mississippi River and south of the Ohio River).
The teeth in odontocetes are made of baleen
Indicate whether the statement is true or false