Across
- 4. a person who studies the natural relationships between the air, land, water, animals, plants, etc
- 5. a more advanced food chain
- 7. non-living organism
- 8. the surroundings or conditions in which a person, animal, or plant lives or operates
- 10. the surroundings or conditions in which a person, animal, or plant lives or operates
Down
- 1. a layer of gas and suspended solids extending from the Earth's surface up many thousands of miles
- 2. Living organism
- 3. a system or organization in which people or groups are ranked one above the other according to status or authority.
- 6. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
- 9. the very hot, very dense center of our planet