Across
- 1. the day when day and night are equal
- 4. a natural or artificial body that orbits a planet
- 6. living
- 8. a collection of stars, dust, and gas
- 9. a animal that eats both animals and plants
- 12. small body of ice, rock, and cosmic dust that orbits around the sun
- 13. a instrument that measures temperature
- 17. the short-term condition of the atmosphere
- 18. the period of time when earth rotates once on its axis
- 20. the periodic rise and fall of tides
- 22. amount of matter in a given space
- 23. a test model of a product
- 24. the distance light travels in one year
- 27. the capacity to do work
- 28. small rocky object that orbits the sun
- 29. the study of life
Down
- 2. the movement of cold nutrient rich water to the surface
- 3. mixture of gases that surrounds a planet
- 5. nonliving
- 7. an instrument that measures atmospheric pressure
- 10. a biome with little rainfall and extreme temperatures
- 11. any form of water that falls from the clouds
- 13. a biome that receives little rainfall and has cold temperatures
- 14. basic measure of length in metric system
- 15. an animal that only eats animals
- 16. when the shadow of one celestial object falls on another
- 17. the movement of air caused by differences in air pressure
- 19. part of earth where life exists
- 21. a relationship between two organisms live in close association with each other
- 25. amount of water vapor in air
- 26. heat