When harmful substances are put into rivers this causes what?

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Grades 3, 4 and 5 - Geography - Elementary School - Changes to the Environment — practice the complete quiz, review flashcards, or try a random question.

Physical and chemical disturbances can change the environment drastically. These changes to the world in which we live can be because of natural causes or because of human activity. Environments change all the time, whether its your back garden or the planet as a whole.

Change to the environment is caused by natural ecological processes and by the activities of humans. What can we do to repair any damage we have made by changing the environment?


When harmful substances are put into rivers this causes what?