Across
- 4. - The change of water from liquid water to water vapor.
- 9. mass - A huge body of air that has similar temperature, pressure, and humidity throughout.
- 12. pressure - The weight of air pressing down on an area.
- 13. - A measure of the amount of water vapor in the air.
- 14. - Clouds that form less than 2 kilometers above the ground and look like fluffy, rounded piles of cotton.
- 16. - A science that deals with the atmosphere and with weather.
- 18. - The average, year-after-year conditions of temperature, precipitation, winds, and clouds in an area.
- 20. - An intense windstorm that often forms within a severe thunderstorm.
- 21. warming - This is the rise in the average temperature of Earth's atmosphere and oceans since the late 19th century and its projected continuation.
- 23. - A large, spiraling storm system that can be as much as 600 km across.
- 26. - The transfer of thermal energy.
- 27. - The outermost layer of the atmosphere.
- 29. cycle - The natural sequence through which water passes into the atmosphere as water vapor, precipitates to earth in liquid or solid form, and ultimately returns to the atmosphere through evaporation.
- 30. effect - The way Earth's rotation makes winds in the Northern Hemisphere curve to the right and winds in the Southern Hemisphere curve to the left.
- 32. winds - Winds that blow steadily from specific directions over long distances.
- 33. humidity - A comparison of the actual amount of moisture in the air to the greatest possible amount that could be in the air at the same temperature and pressure.
Down
- 1. - The layer of the atmosphere where the air is thin and most meteors burn up.
- 2. - The direct transfer of energy by electromagnetic waves.
- 3. - An instrument that is used to measure air pressure and predict changes in the weather.
- 5. - The average amount of energy of motion of each molecule of a substance; a measure to determine a substance's level of hot or cold.
- 6. - The transfer of thermal energy that results from the collision of particles.
- 7. - The liquid water that returns to Earth's surface, usually as rain or snow.
- 8. - The transfer of thermal energy through liquids and gases.
- 10. - The bottom layer of the Earth's atmosphere.
- 11. - The layer of the atmosphere in which ozone is present.
- 12. - Mixture of gases that surrounds Earth.
- 15. - Clouds that form in flat layers.
- 17. - A very strong storm with a lot of rain, thunder, and lightning.
- 18. - The process by which water vapor changes from a gas to a liquid.
- 19. - An instrument used to measure wind speed.
- 21. effect - The process by which gases hold heat in the air.
- 22. - Wispy, feathery clouds made mostly of ice crystals that form at high levels, above about 6 kilometers.
- 24. winds - Winds that blow over short distances.
- 25. energy - The total energy of motion in the molecules of a substance.
- 28. - The border between two air masses that collide.
- 31. stream - A high-speed, meandering wind current, generally moving from a westerly direction at speeds often exceeding 400 kilometers (250 miles) per hour at altitudes of 10 to 15 kilometers (6 to 9 miles).