Most reports for the U.S. of loss due to erosion are based on

A) thousands of measurements of soil depth around the country.
B) measurements of the amount of soil suspended in the oceans and major rivers.
C) changes in the salinity and silt of the ocean where major rivers flush out to sea.
D) indirect measurements using maps, aerial photography, and precipitation data from land stations.


D

Environmental & Atmospheric Sciences

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Environmental & Atmospheric Sciences