Across
- 5. microscopic organisms that live in aquatic environments
- 6. ecosystem in which water either covers the soil or is present near the surface
- 7. all organisms that live in a place with their nonliving environment
- 9. different populations that live together in an area
- 11. all of the water above and below Earth's surface
- 12. study of interactions among organisms
- 13. material formed from decaying leaves and other organic matter
- 15. day-to-day conditions of the atmosphere
- 16. layer of permanently frozen subsoil found in the tundra
- 17. average year-to-year conditions of temperature, etc.
Down
- 1. part of Earth where life exists
- 2. group of similar organisms that can breed and produce offspring
- 3. layer in a rain forest found underneath the canopy
- 4. biome with long cold winters and a few months of warm weather
- 8. group of ecosystems that share similar climates
- 9. dense covering formed by the leafy tops of tall trees
- 10. all of the rock at and below Earth's surface
- 12. kind of wetland formed where a river meets the ocean
- 14. groups of individuals of the same species that live in the same area
- 18. thin layer of gases that surround Earth