7th Grade Chapter 6 Lesson 5

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7th Grade Chapter 6 Lesson 5

  1. 1. 7th Grade Chapter 6 Lesson 5 <ul><ul><li>Pgs. 221 - 231 </li></ul></ul><ul><ul><li>For Student Use Only </li></ul></ul>
  2. 2. Clouds <ul><li>Weather Maker: </li></ul><ul><ul><li>The sun is the basic source for all weather. </li></ul></ul><ul><ul><ul><li>Seasons, clouds, winds, rain, snow, hail, lightning, rainbows, hurricanes are all from sun </li></ul></ul></ul><ul><ul><ul><li>Sun evaporates water </li></ul></ul></ul><ul><ul><ul><li>Sun creates temp. differences which causes winds </li></ul></ul></ul><ul><ul><li>Water Vapor in the air is humidity </li></ul></ul><ul><ul><ul><li>High humidity- tropical </li></ul></ul></ul><ul><ul><ul><li>Low humidity- arid </li></ul></ul></ul>
  3. 3. Clouds <ul><li>Weather Maker: </li></ul><ul><ul><li>Humidity- the amount of water vapor in the air </li></ul></ul><ul><ul><ul><li>Temperature affects amount of water vapor the air can hold </li></ul></ul></ul><ul><ul><ul><li>WARM air can hold more water vapor than cold air can </li></ul></ul></ul><ul><ul><li>Saturated- when air holds all the water vapor it can </li></ul></ul><ul><ul><li>Humidity is shown in percentage </li></ul></ul>
  4. 4. Clouds <ul><li>Weather Maker: </li></ul><ul><ul><li>Relative Humidity: </li></ul></ul><ul><ul><ul><li>The amount of water vapor in the air compared to what it can hold </li></ul></ul></ul><ul><ul><li>Dew Point: </li></ul></ul><ul><ul><ul><li>The temperature at which cooling air becomes saturated (100% humidity) </li></ul></ul></ul><ul><ul><ul><li>Lowest temp. at which air can keep hold of water </li></ul></ul></ul><ul><ul><ul><li>Dew- when the air at ground level gets cool and water “falls out” </li></ul></ul></ul>
  5. 5. Clouds <ul><li>Weather Maker: </li></ul><ul><ul><li>Weather Proverbs: </li></ul></ul><ul><ul><ul><li>When dew is on the grass, Rain will never come to pass </li></ul></ul></ul><ul><ul><ul><ul><li>Water was taken out of air </li></ul></ul></ul></ul><ul><ul><ul><li>When grass is dry at morning light, Look for rain before the night </li></ul></ul></ul><ul><ul><li>Frost: </li></ul></ul><ul><ul><ul><li>Water vapor freezes immediately into a solid (no liquid state) </li></ul></ul></ul>
  6. 6. Clouds <ul><li>Weather Maker: </li></ul><ul><ul><li>Weather Proverbs: </li></ul></ul><ul><ul><ul><li>When dew is on the grass, Rain will never come to pass </li></ul></ul></ul><ul><ul><ul><ul><li>Water was taken out of air </li></ul></ul></ul></ul><ul><ul><ul><li>When grass is dry at morning light, Look for rain before the night </li></ul></ul></ul><ul><ul><li>Frost: </li></ul></ul><ul><ul><ul><li>Water vapor freezes immediately into a solid (no liquid state) </li></ul></ul></ul>
  7. 7. Clouds <ul><li>Weather Maker: </li></ul><ul><ul><li>Clouds are made of very tiny water droplets </li></ul></ul><ul><ul><ul><li>It takes over one million of these droplets to make a single raindrop </li></ul></ul></ul><ul><ul><li>Higher air is colder it is farther from the surface of the Earth </li></ul></ul><ul><ul><li>Lapse Rate- the rate at which the air temperature falls </li></ul></ul>
  8. 8. Clouds <ul><li>Cooler Temps: </li></ul><ul><ul><li>Cooler temps are at higher elevation </li></ul></ul><ul><ul><li>Warmer temps are at lower elevation </li></ul></ul><ul><li>Once past the troposphere the temperature can increase depending on make-up of atmosphere </li></ul><ul><li>Temperature Inversion: warmer air lying on top of colder air </li></ul>
  9. 9. Clouds <ul><li>Clouds must have something to condense upon </li></ul><ul><li>Condensation Nucleus: </li></ul><ul><ul><li>The center of a tiny droplets of liquid water </li></ul></ul><ul><li>Clouds can build and they can vary according to how they were formed </li></ul><ul><ul><li>Thermals: rising columns of warm air </li></ul></ul>
  10. 10. Clouds <ul><li>Unstable Air </li></ul><ul><ul><li>Unstable air: when rising air cools more slowly than surrounding air there can be storms </li></ul></ul><ul><ul><li>If day is very hot and humid it can produce a thunderhead (supercloud) </li></ul></ul><ul><li>Stable Air: </li></ul><ul><ul><li>Thermals cool more rapidly than surrounding air </li></ul></ul><ul><li>Clouds in the morning can help predict weather </li></ul>
  11. 11. Clouds <ul><li>Fun Forecasting: </li></ul><ul><ul><li>If fleecy white clouds cover heavenly way, No rain should mar your plans that day </li></ul></ul><ul><ul><li>In the morning, mountains; In the evening, fountains </li></ul></ul><ul><li>Collision of Clouds: </li></ul><ul><ul><li>Cold air, strike warm air and create a front </li></ul></ul><ul><ul><li>Weather front: the boundary between a warm air mass and a cold air mass </li></ul></ul>

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