Four Systems of Our Earth

1. Four Systems of Our Earth

2. Composition of Earth • Earth Has 4 main systems that interact:

3. The Atmosphere– layer of gas that surrounds Earth more commonly known as “air”.

4. Atmosphere. How do you know its there • Is this “air” that surrounds us considered matter? Does it weigh anything? How do you know? • Think about it and decide on an answer. • Talk in groups with the person who sits by you • Be ready to tell the class what you decided and why.

5. Weight of the atmosphere • Gases are in the atmosphere. • They are things we learned about in the periodic table: Nitrogen, Oxygen, Carbon Dioxide, Hydrogen • It is matter! Sound can travel through it.

6. Even though you can’t see them, Atoms make up gases. • Are some atoms bigger than others? • Are their atomic weights all the same?

7. Helium vs. Carbon Dioxide Do you think of helium as light and floating or heavy and falling? Do you think about Carbon Dioxide as light and floating or heavy and falling….think about the gas released from dry ice… does it go up or down? http://jp.youtube.com/watch?v=F239cINIADs

8. Composition of Earth • Earth Has 4 main systems that interact: • The Atmosphere • Mostly Nitrogen and Oxygen • Water vapor is responsible for clouds and precipitation • Has layers • Protects us from meteors and comets, x-rays, gamma rays, ultra violet light • The Hydrosphere • The Biosphere • The Geosphere

10. Composition of Earth’s atmosphere Exosphere • Earth Has 4 main systems that interact: • The Atmosphere • layers • Exosphere • Thermosphere • Mesosphere • Stratosphere • Troposphere • The Hydrosphere • The Biosphere • The Geosphere

11. Composition of Earth’s atmosphere Exosphere • Earth Has 4 main systems that interact: • The Atmosphere • Troposphere • Contains most clouds and weather. • Temperature cools as you go higher50% of sun’s energy passes through, 50% is reflected back. • Most of the troposphere’s heat is from Earth (convection) • Stratosphere • Mesosphere • Thermosphere • The Hydrosphere • The Biosphere • The Geosphere

12. Contains most clouds and weather. • Temperature cools as you go higher50% of sun’s energy passes through, 50% is reflected back. • Most of the troposphere’s heat is from Earth (convection)

13. Troposphere and Clouds • Among other gases there is water vapor in the troposphere. • Clouds—form when air rises, cools to its dew point, and becomes saturated (moist).

14. Water Vapor Demonstration

15. Water Cycle Demo

16. Precipitation-falling water in the form of rain, freezing rain, sleet, snow, or hail

17. Section 2: Earth’s WeatherTroposphere • Weather—the atmosphere’s condition in terms of temperature, cloud cover, wind speed and direction, humidity, and air pressure. • What are different types of weather? ____________________________________________________________________________________________________________________________________________

18. Section 2: Earth’s WeatherTroposphere • Temperature—a measure of how fastair molecules are moving. • When molecules are moving rapidly, temperature is high. • Celsius and Fahrenheit thermometers measure air temperature.

19. Section 2: Earth’s WeatherTroposphere • What is the temperature like today? • Hot/ Cold ______________________ • Degrees Fahrenheit_______________ • Degrees Celsius _________________

20. Section 2: Earth’s WeatherTroposphere • Energy is transferred between fast-moving molecules and slower-moving molecules. • Conduction—transfer of energy when molecules collide. • Give an example of something heating up due to conduction: __________________________________ • Convection occurs when warm air rises and cool air sinks. • Give an example of something heating up due to convection: ___________________________________

21. Section 2: Earth’s WeatherTroposphere • Air pressure— air weight that varies over Earth’s surface. • Warmer air is less dense and exerts less pressure. • Cooler air is more dense and exerts more pressure.

22. Air Pressure Demonstration—Write about what you learned

23. Humidity— the amount of watervapor in the air • Temperature affects how much moisture is in the air.

24. Dewpoint—when the air is holding as much water vapor as it can • Relative humidity— a measure of the amount of water vapor present compared to the amount that could be held at a specific temperature.

25. THAT WAS ALL ABOUT THE TROPOSPHERE!!! • Lets cover the other layers briefly. • Go back up to the graphic organizer at the top of your notes and fill in info about each layer.

26. Composition of Earth’s atmosphere • Earth Has 4 main systems that interact: • The Atmosphere • Troposphere • Stratosphere • 10 km to 50 km • contains ozone that absorbs much of the Sun’s ultraviolet radiation. • Gets warmer as you go up. • Mesosphere • Thermosphere • The Hydrosphere • The Biosphere • The Geosphere

28. Composition of Earth’s atmosphere • Earth Has 4 main systems that interact: • The Atmosphere • Troposphere • Stratosphere • Mesosphere • 50-85 km • The coldest part of the atmosphere. It can get down to -90°C in the mesosphere. • Thermosphere • The Hydrosphere • The Biosphere • The Geosphere

30. Composition of Earth’s atmosphere • Earth Has 4 main systems that interact: • The Atmosphere • Troposphere • Stratosphere • Mesosphere • Thermosphere • 80-500 km • Temperatures increase up to 1,700°C • Filters out x-rays and gamma rays from the sun. • This is an image of the space shuttle as it is orbiting around the Earth. The space shuttle orbits in the thermosphere of the Earth. • The Hydrosphere • The Biosphere • The Geosphere

32. Exosphere • The last layer of the atmosphere • Difficult to tell where it stops and space begins • Very few atoms in this layer of the atmosphere

34. Ionosphere • Within the mesosphere and thermosphere is a layer of electrically charged particles. This layer allows radio waves to travel across the country to another city. • www.blo ust.com/henley