1. Chapter 15: Atmosphere Section 15.1: Earth's Atmosphere
Table of Contents
Chapter 15: Atmosphere
Section 15.1: Earth's Atmosphere

2. Makeup of the Atmosphere
Earth’s Atmosphere 1
Makeup of the Atmosphere
Earth's (1) atmosphere is a mixture of gases, solids, and liquids that surrounds the planet.
It extends from Earth's surface to outer space.

3. Makeup of the Atmosphere
Earth’s Atmosphere 1
Makeup of the Atmosphere
Earth's early atmosphere, (2) produced by erupting volcanoes,

4. Gases in the Atmosphere
Earth’s Atmosphere 1
Gases in the Atmosphere
. (3) Nitrogen=78% and Oxygen = 21%

5. Earth’s Atmosphere 1

6. Earth’s Atmosphere 1
Atmospheric Pressure
Air pressure is greater (4) near Earth's surface and least (5) in the exosphere.

7. Temperature in Atmospheric Layers
Earth’s Atmosphere 1
Temperature in Atmospheric Layers
The (6) Sun is the source of most of the energy on Earth.

8. Question (7) Troposphere—temp. decreases with height
Stratosphere—temp. increases with height because ozone absorbs radiation
Mesosphere—temp. decreases with height because no radiation is absorbed
Thermosphere and Exosphere—temp. increases because radiation is absorbed

9. Earth’s Atmosphere 1
The Ozone Layer
The ozone layer contains a high concentration of ozone and (8) shields you from the Sun's harmful energy.
(9) UV rays can cause skin cancer

10. CFCs 1 (10) Chlorofluorocarbon molecules destroy ozone.
Earth’s Atmosphere 1
CFCs
(10) Chlorofluorocarbon molecules destroy ozone.

11. Energy Transfer in the Atmosphere2
Energy from the Sun
The (12) Sun provides most of Earth's energy. It drives the wind, causes ocean currents, and allows plants to grow.

12. Energy Transfer in the Atmosphere2
Energy from the Sun

13. Energy Transfer in the Atmosphere2
Heat
(13) Heat is energy that flows from an object with a higher temperature to an object with a lower temperature.
Heat then is transferred through the atmosphere in (14) three ways—radiation, conduction, and convection.

14. Energy Transfer in the Atmosphere2
Radiation
Energy from the Sun reaches Earth in the form of radiant energy, or radiation.
Energy that is absorbed causes (15) temperature to go up.

15. Energy Transfer in the Atmosphere2
Conduction

16. Energy Transfer in the Atmosphere2
Convection

17. Question (16)
Radiation is how energy gets from the sun to Earth. Convection is how the air and water is heated. Conduction is how the land is heated.

18. Air Movement 3
Forming Wind
(18) Differences in density and air pressure cause winds.
(19) Uneven heating of Earth’s surface by the Sun causes some areas to be warmer than others.
Wind is the movement of air from an area of (20) higher pressure to an area of lower pressure.

19. Land and Water Land and water heat and cool at different rates.
(21) Land heats up faster then water. So in day land is warmer than water.
(22) Land cools faster than water. So at night land is colder than water.