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
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Which of the following is a common use of a mineral?
A. phosphorous is used in fertilizer B. halite is used as salt C. feldspar is used in ceramics D. hematite and magnetite are used for iron and steel E. All of these choices are correct.
Explain the relationship between phenomenological rupture, trust, and the creation of ecological knowledge by discussing the Practical Farmers of Iowa example from the book.
What will be an ideal response?
Nacreous clouds form in the ____
a. troposphere b. stratosphere c. ionosphere d. mesosphere e. thermosphere
Which of the following region would you expect to have the highest levels of seawater salinity?
A) subtropical oceans B) polar oceans. C) equatorial oceans D) midlatitude oceans E) subarctic oceans