Across
- 4. the sound that results from the rapid expansion of air along the lightning strike
- 7. small, intense weather systems that produce strong winds, heavy rain, lightning, and thunder
- 9. an instrument used to measure air pressure
- 11. a large, rotating tropical weather system that has wind speeds of at least 120 km/h
- 12. the atmospheric layer above the the troposphere
- 15. areas that have low pressure than the surrounding areas
- 17. the lowest layer,which lies next to the earths surface
- 18. a small, spinning column of air that has high wind speeds and low central pressure and that touches the ground
- 19. the winds that blow from 30 degrees latitude almost to the equator
Down
- 1. an instrument used to measure wind speed
- 2. mixture of gases surrounding the earth
- 3. the area in which two types of air masses meet
- 5. the apparent curving of the path of winds and ocean currents due to the earths rotation
- 6. the amount of water in the air
- 8. the middle layer of the atmosphere
- 10. a collection of millions of tiny water droplets or ice crystals
- 13. a tool used to measure air temperature
- 14. the introduction of pollutants into the atmosphere by human and natural causes
- 16. an electric discharge that occurs between a positively charged area and a negatively charged area
- 20. the condition of the atmosphere at a certain time and place