What famous North American landmark is constantly moving backward?
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Tower of pisa
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Eiffel Tower
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Niagara Falls
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Statue of Liberty
C
Correct answer
Explanation
Niagara Falls is gradually eroding backward, moving upstream toward Lake Erie at a rate of about 1 foot per year due to water flow wearing away the rock. The Tower of Pisa leans but doesn't move backward, the Eiffel Tower is stable, and the Statue of Liberty is stationary.