Which of the following is central to most of the efforts to conserve topsoil?
a. an emphasis on agricultural practices that enhance monocultures
b. annual crop rotations
c. keeping the soil covered by vegetation
d. preventing insect pests from destroying valuable crops
e. conversion of croplands into pasturelands or feedlots
C
Environmental & Atmospheric Sciences
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A stick insect closely resembles the vegetation in which it lives. This is an example of ____________________.
Fill in the blank(s) with the appropriate word(s).
Environmental & Atmospheric Sciences
Ranching is practiced in the dry lands of both developing and relatively developed countries
Indicate whether the statement is true or false.
Environmental & Atmospheric Sciences
What is an earthquake? Under what circumstances do most large earthquakes occur?
What will be an ideal response?
Environmental & Atmospheric Sciences
What percentage of Australia is urban?
A) 70% B) 45% C) 98% D) 67% E) 89%
Environmental & Atmospheric Sciences