ENVIRONMENT

3. pollution the introduction of harmful substances or products into the environment. This can include air pollution, water pollution, land pollution, and noise pollution.
4. other options or choices that are available. For example, renewable energy sources such as solar and wind power are alternatives to fossil fuels such as coal and oil.
7. power a type of renewable energy that uses sunlight to generate electricity. Solar panels are used to convert sunlight into electricity, which can then be used to power homes and businesses.
9. a structure made of glass or plastic that is used to grow plants. Greenhouses trap heat from the sun, which allows plants to grow year-round.
10. are the definitions of the words you requested:

1. the act of keeping something in its original state. This can refer to the preservation of historical sites, natural habitats, or endangered species.
2. the process of making something impure or unclean. This can happen when pollutants are introduced into the environment, or when food or water is contaminated with bacteria or other harmful substances.
5. a situation in which there is not enough of something to meet demand. This can happen with food, water, energy, or other resources.
6. pollution the contamination of water bodies, such as lakes, rivers, and oceans. This can happen when pollutants are discharged into the water from factories, farms, or sewage treatment plants.
8. panel a device that converts sunlight into electricity. Solar panels are made up of many solar cells, which are small devices that absorb sunlight and generate electricity.