Across
- 2. Tiny organism that float near the surface of the water
- 6. The movement of air caused by differences in air pressure
- 9. An event in which the shadow of one celestial body falls on another
- 10. A substance that reduces the transfer of electricity, heat, or sound
- 12. A small body of ice,rock and cosmic dust
- 15. A Latin root meaning three
- 17. A biome that has very cold temperatures and little rainfall
- 19. An instrument that measures atmospheric pressure
- 20. Causes the Earth's day and night
Down
- 1. Term for non-living
- 3. The brightness of a star as seen on Earth
- 4. The movement of cold ocean water to the surface layer of the ocean
- 5. An organism that only eats plants
- 7. Extreme temperatures very hot during the day and cool at night
- 8. The amount of water vapor in the air
- 11. A close relationship between species
- 13. A planet that has a deep, massive, atmosphere, such as Jupiter, Saturn, Neptune, and Uranus
- 14. A diagram that shows the feeding relationships between organism in an ecosystem
- 16. The time required for Earth to rotate once on its axis
- 18. The potential difference between two points