We used to think that once solid wastes were placed in landfills, they went away. Now we understand that
a. highly toxic liquids often ooze out of landfills and pollute the water and soil in local areas
b. material buried in landfills tends to remain for long periods of time
c. solid wastes in landfills do not break down as quickly as many people expected
d. all of the above
Answer: d. all of the above.
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