In the United States, conversion of rural land to other uses
A. affects a little less than 1.5 million acres each year.
B. no longer occurs to any significant extent; land uses by now are generally fixed.
C. is done primarily to provide more highways and housing.
D. has purposely been halted to conserve farmland.
Answer: A
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A ____________________ is an element or inorganic compound that occurs naturally in the earth's crust.
Fill in the blank(s) with the appropriate word(s).
Nuclear fission occurs when a high-energy subatomic particle, a neutron, strikes a uranium atom, releases energy, and
A. Releases neutrons B. Releases protons C. Combines with another neutron to release even more energy D. Breaks in half, causing another atom to break E. Releases an electron in a gamma wave
Which of the following is true?
What will be an ideal response?
Formaldehyde is an especially problematic indoor pollutant because it is
A. Highly carcinogenic B. Used in so many household materials C. Produced naturally by the earth below buildings D. Far more toxic than most other substances E. So difficult to detect