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OpenStudy (anonymous):

The United States and Canada have worked to solve environmental problems such as water pollution, soil erosion, and? a. acid rain b. tariffs on imported goods c. free trade d. cultural cooperation

OpenStudy (ashleyisakitty):

Acid Rain. None of the others are environmental problems.

OpenStudy (anonymous):

ACID RAIN ^^^^^

OpenStudy (anonymous):

okay thanks!

OpenStudy (ashleyisakitty):

You're welcome!

OpenStudy (anonymous):

yup

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