Pollution - The presence of harmful substances or waste materials that contaminate the environment.Ozone layer, Ozone layer - A protective layer of gas in the Earth's atmosphere that shields us from the sun's harmful rays., Air - The mixture of gases that we breathe and surrounds the Earth., Temperature - How hot or cold something is., Ocean - A large body of saltwater that covers most of the Earth's surface., Water pollution - When harmful substances or pollutants make the water dirty and unsafe for living things., Waste - Any unwanted or discarded material or substance., Soil pollution - When harmful substances contaminate the soil, making it difficult for plants to grow., Plant - A living organism that usually grows in the ground and makes its food through photosynthesis., Deforestation - The act of cutting down or removing large areas of trees, which disrupts the balance of nature.,

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