Most Reports of National Erosion Loss Are Based on

question 42

Multiple Choice

Most reports of national erosion loss 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.

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