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Science Ch 5
| Question | Answer |
|---|---|
| air pressure | the weight of the air |
| barometer | air pressure is measured with this |
| as altitude increases... | air pressure decreases |
| troposphere | weather occurs here; the first layer of the atmosphere |
| ozone | protects the surface of the earth from the sun's harmful rays |
| weather | the condition of the atmosphere at any moment in time |
| altitude | measurement of the distance above sea level |
| air is a mixture of... | nitrogen, oxygen, carbon dioxide, and other gasses |
| atmosphere | the thing blanket of gasses and dust particles that surround and protect the earth |
| gravity | holds the atmosphere close to the earth |
| wind | moving air |
| local winds | influenced by temperature changes in a small area |
| global winds | occur in large, circular belts around the earth |
| air mass | a body of air that has about the same temperature and moisture |
| front | the boundary where two unlike air masses meet |
| low-pressure air mass | usually has warm, moist air |
| high-pressure (dense) air mass | usually has cool, dry air |
| wind vane | instrument that shows the direction wind is blowing from |
| anemometer | this measures wind speed |
| winds are identified by.... | the direction from which they blow |
| cloud | forms from condensed water vapor or ice crystals |
| precipitation | water that falls from the atmosphere and reaches the ground |
| humidity | water vapor in the atmosphere |
| nimbo | the prefix that is added to the names of some clouds to show that clouds produce precipitation |
| alto | the prefix that is added to the names of some clouds to show that clouds are part of the middle altitude |
| hail | raindrops that are pushed up over and over again into tall clouds and freeze before falling to the earth |
| sleet | raindrops that freeze on their way to the earth and land as tiny ice pellets |
| snow | ice crystals in the clouds that join together and fall to the earth |
| freezing rain | raindrops that fall from warm air when the surface of the earth is below freezing, causing the raindrops to freeze as they hit the earth |
| rain | water droplets in the clouds that join together to make larger drops |
| weather watch | issued when conditions are right for a type of severe weather, but that severe weather is not currently happening |
| forecast | a prediction of future weather conditions |
| weather warning | issued when the storm has begun and people have reported seeing it |
| meteorologists | scientists who study the atmosphere and weather |
| thunderstorm | occurs when a large, swift-moving warm air mass meets a cold air mass |
| lightning | static electricity that moves between clouds or between the clouds and the earth |
| thunder | a rumble resulting from hot air instantly expanding and cooler air rushing in |
| tornado | a funnel-shaped cloud of swirling winds that reaches down to the ground |
| understanding and predicting weather patterns helps to... | protect human life |
| hurricane | severe storm that may form over a low-pressure area of an ocean |
Created by:
tjahn
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