The environment can be changed in many ways, both by humans and nature. Some of these changes are good, while some are not. Sort the activities below according to whether they will have a positive or negative impact.

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Earthquake activity causing damage in a major city.
Planting native bushes to help control erosion.
Producing and emitting smog from a smokestack.
Volcanic eruption resulting in the formation of an island.
Positive impact Negative impact