4.2 4.3 notes
- 1. The ________________________ 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 ______________ and ___________ 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 ______________________ 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 __________________ like soil, pollen, grains, and soot that help form clouds
- 2. Weather: the state of the ______________________ at a certain place and time It _________________ all the time We can observe weather by ____________________ properties of the air like temperature, humidity, air pressure, and wind These can also help us predict weather
- 3. Temperature is how _______ or ___________ something is
- 4. Humidity: the amount of _________ ____________ air can hold ___________ _________ holds more water vapor than cool air Air that is ___________ holds a lot of water vapor Humid air is more likely to produce clouds and _______________________
- 5. Air has weight We live at the bottom of Earth’s atmosphere, so there is a lot of air above us The ___________ of the weight of the air pushing down on us is air pressure Air pressure is not the same everywhere ______________________ affects air pressure _______ 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 __________ 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
- 6. Wind is the movement of air from areas of ___________ pressure to areas of _________ pressure When the difference of pressure great, the wind blows faster When the difference of pressure is small, the wind blows slower
- 7. Wind is the movement of air from areas of ___________ pressure to areas of _________ pressure When the difference of pressure great, the wind blows faster When the difference of pressure is small, the wind blows slower