4.2 4.3

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4.2 4.3

  1. 1. 4.2-4.3
  2. 2.  The atmosphere is a layer of gases that wraps around Earth like a blanket  It holds in heat, contains the air we breathe, protects living things from the sun’s harmful radiation, and helps the planet recycle its water supply The atmosphere is made up of nitrogen and oxygen with small amounts of carbon dioxide and water vapor  Earth is the only planet who’s atmosphere is formed of these gases  Carbon dioxide is a greenhouse gas that absorbs Earth’s heat and keeps the planet warm  Water vapor is a greenhouse gas that plays an important role in weather Earth’s atmosphere is also made up of particles like soil, pollen, grains, and soot that help form clouds
  3. 3. Weather: the state of the atmosphere at a certain place and time  It changes all the time  We can observe weather by measuring properties of the air like temperature, humidity, air pressure, and wind These can also help us predict weather
  4. 4. Temperature is how hot or cold something is
  5. 5. Humidity: the amount of water vapor air can hold  Warm air holds more water vapor than cool air  Air that is humid holds a lot of water vapor  Humid air is more likely to produce clouds and precipitation
  6. 6.  Air has weight We live at the bottom of Earth’s atmosphere, so there is a lot of air above us  The force of the weight of the air pushing down on us is air pressure Air pressure is not the same everywhere  Temperature affects air pressure Low air pressure  Air gets warmer  gas particles get farther apart and rises  Rising air presses down with less force and creates a low area of pressure  Clouds form where low pressure forms High air pressure  Air gets cooler  gas particles get closer together and sink  Sinking air presses down with more force and creates a high area of pressure
  7. 7. Wind is the movement of air from areas of high pressure to areas of low pressureWhen the difference of pressure great, the wind blows fasterWhen the difference of pressure is small, the wind blows slower

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