Week 28: Earth Day

5. To have a legal agreement to use something, like a car or an apartment, for a certain period of time in exchange for payment.
7. A lightweight, synthetic material that can be shaped into many forms; often used for containers, bags, and toys.
9. A solid material that is usually hard and shiny, like iron or aluminum, and is used to make many products.
10. To make something dirty or harmful, especially by adding waste or chemicals.
12. To collect and process materials like paper, glass, or plastic so they can be made into new products instead of being thrown away.
14. A material that can be broken down naturally by bacteria or other living organisms, returning to the environment without harming it.
16. The careful use and protection of natural resources, like water, trees, and wildlife, to keep them safe for the future.
17. Created or constructed; the past tense of "make."
19. A series of actions or steps taken to achieve a particular outcome or result.
20. Something designed to be used once and then thrown away.
21. Having nothing inside; not filled.

1. Unwanted materials or substances that are left over after use.
2. The presence of harmful substances in the environment, which can cause problems for plants, animals, and people.
3. The smallest amount or degree; the lowest in a group.
4. Something that can be used again instead of being thrown away after one use.
6. The act of getting rid of something, usually trash or waste.
8. To use less of something, which helps to save resources and decrease waste.
11. The surrounding conditions where people, animals, and plants live, including air, water, and land.
13. The process of cutting down or clearing trees from a forest, which can harm the environment.
15. Waste material or things that are no longer wanted, like trash.
18. The study of how living things interact with each other and their environment.
22. A person whose job is to clean and take care of a house or other building.