Surface mining techniques are used to extract ____% of the coal used in the United States

a. 20
b. 40
c. 60
d. 80
e. 100


C

Environmental & Atmospheric Sciences

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Suppose a piece of paper is illuminated with white light and appears red. Which of the following statements explains why the paper appears red?

A. The paper reflects red and absorbs other visible wavelengths. B. The paper emits red light. C. The paper disperses white light. D. The paper absorbs red and reflects other visible wavelengths.

Environmental & Atmospheric Sciences

Members of a clade can have different derived and primitive characteristics

a. True b. False

Environmental & Atmospheric Sciences

The United States maintains a focus on terrorism hot spots in the African region. List the countries of this group:

Environmental & Atmospheric Sciences

Which of these numbered features is an atoll?

A. 1 B. 2 C. 3 D. All of these choices are correct. E. None of these choices are correct.

Environmental & Atmospheric Sciences