Posted by **Meg** on Wednesday, May 16, 2007 at 9:06pm.

I can't find out anything about this one Please help.

The increase in the use of unleaded gasoline is thought to be responsible for a ___% decrease in the amount of lead in the Mississsippi River in the last decade.

a. 10

b. 20

c. 30

d. 40

e. 50

I went to google.com and searched on mississipi river lead content. Got this first this out. Your answer is in the abstract.

http://www.sciencemag.org/cgi/content/abstract/230/4724/439
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