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Ozone in the upper atmosphere has been depleted by a. sulfur dioxide. b. chlorofluorocarbons. c. carbon dioxide. d. oxygen.
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Canada must balance the economic opportunities offered by its natural resources with the need to maintain links to the united states maintain high tariffs preserve the environment protect its borders
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Which items are associated with the formation of salt domes?
oil
low density
coal...
oil
low density
coal...
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