1. Section 1.3 The atmosphere
Chapter 1
Section 1.3 The atmosphere

2. Atmosphere
Made up of layers: troposphere, stratosphere, mesosphere, and thermosphere
78% Nitrogen, 21% Oxygen, 0.04% Carbon dioxide

3. Carbon dioxide (CO2)
Plants use this to make food, then release oxygen (O2)
Released into the atmosphere by volcanic eruptions and whenever fuels such as wood, coal, or gasoline is burned
Lets sunlight in and traps the heat!
GREENHOUSE EFFECT!

4. Troposphere
Troposphere- the layer of the atmosphere that touches the surface of the Earth
Contains most of the water vapor
Where weather occurs

5. Stratosphere
Stratosphere- beyond the troposphere, reaching a height of 50 km above Earth
Upper stratosphere contains ozone
Ozone- form of oxygen gas containing three oxygen atoms per molecule

6. Ozone
Importance: filters out most of the ultraviolet or UV radiation given off from the sun
Without this layer, life on Earth would be destroyed!!!

7. Mesosphere
Mesosphere- coldest layer of the atmosphere, with temperatures as low as degrees Celsius!

8. Thermosphere Thermosphere- outermost layer of the atmosphere
Experiences temperatures as high as 2000 degrees Celsius!!!
Gas molecules receive intense heat from the sun, they become loose electrons and become ions. This is known as the ionosphere.

9. Ionosphere Ionosphere- part of the thermosphere
Gas molecules reunite with free electrons and light is given off.
This usually occurs at the poles---Aurora!

11. Review!!!
Which layer of the atmosphere contains the ionosphere? Why does this layer have this name?
Why is the ozone layer important to living things?
People who live at sea level often have trouble breathing at the tops of high mountains. Why do you think this is true?

12. Chapter 1
Section 1.4 The Biosphere

13. Biosphere
Biosphere- all the parts of Earth that support and contain life
If Earth were an apple, the layer that supports life would be only about as thick as the apple’s skin!!!

14. Life on Earth
Life is usually limited to the tops of mountains and deep in the ocean because of high pressure and less oxygen available
All organisms depend on all parts of the biosphere to survive

15. Biosphere
Organisms find the energy they need from all parts of the biosphere
Example: Trees use the sunlight for food, rocks for anchoring, soil for nutrients, water for living

16. Review!!! What parts of Earth make up the biosphere?
List two ways in which you interact with each of the three parts of the biosphere everyday.
In what ways does each part of the biosphere contribute to the production of food you eat?