Across
- 4. when too many toxins are present and change the environment
- 5. the process of plant and animal remains rotting
- 6. a mix of tiny rocks and decomposed plants
- 7. tiny pieces of broken rock in soil
Down
- 1. a hole or tunnel dug underground by a small animal to live in
- 2. the type of soil where plants grow from
- 3. a mix of decomposing plants and animals