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26 Cards in this Set
- Front
- Back
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1. air
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The mixture of gases that makes up the Earth’s atmosphere.
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2. nitrogen
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A colorless, odorless, tasteless gas that makes up about four fifths of the air.
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3. oxygen
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A colorless, odorless, tasteless gas that makes up about one fifth of the air.
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4. carbon dioxide
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A gas made of carbon and oxygen atoms that plants need for photosynthesis.
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5. water vapor
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Water that is in the form of a gas.
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6. atmosphere
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The layer of gases surrounding the Earth or other planets.
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7. troposphere
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The layer of air in Earth’s atmosphere where weather takes place, just above Earth’s surface.
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8. weather
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The condition of the atmosphere at a certain place and time.
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9. greenhouse effect
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The process in which heat from the Sun builds up near Earth’s surface and is trapped by the atmosphere.
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10. wind
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Moving air caused by the uneven heating of the Earth’s surface.
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11. barometer
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A weather instrument that measures air pressure.
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12. air pressure
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The weight of air pushing on everything around it.
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13. high-pressure area
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An area of higher air pressure than that of the surrounding air.
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14. low-pressure area
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An area of lower air pressure than that of the surrounding air.
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15. wind vane
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A weather instrument that shows the direction the wind is coming from.
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16. wind sock
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A cloth bag, open at one end, that shows wind direction.
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17. anemometer
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A device used to measure wind speed.
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18. water cycle
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The movement of water into the air as water vapor and back to Earth’s surface as rain, snow, or hail.
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19. evaporation
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Water that changes from a liquid to a gas.
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20. condensation
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Water that changes from a gas to a liquid.
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21. cloud
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Billions of tiny drops of water that condensed from the air.
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22. fog
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A layered cloud that forms close to the ground.
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23. precipitation
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Water that falls to Earth’s surface as rain, snow, sleet, or hail.
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24. rain gauge
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A device that measures precipitation.
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25. humidity
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The amount of water vapor in the air.
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26. relative humidity
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The amount of water vapor that the air is holding compared with the amount that it could hold at that temperature.
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