What is pollution?, Harmful substances in the environment, Cleaning the environment, Saving trees, Garbage on land, What is meant by "marine?", Related to land, Related to air, Related to the sea or ocean, Related to forest, What do you think "biodiversity" means?, The number of people in a country, Only plants in forests, Only animals in the ocean, The variety of living things in an area, Water pollution is..., Clean water in rivers, Animals swimming in the water, Harmful substances in water, People swimming in the water.

Pollution

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