1. Mr. Fetch's Earth Science Class
The Atmosphere
Meteorology
Mr. Fetch's Earth Science Class
Mr. Fetch’s Earth Science Classroom A+

2. Mr. Fetch's Earth Science Class
The Atmosphere
A layer of gas that surrounds Earth.
Created long ago by volcanic eruptions.
Held around Earth by gravity.
Regulates Earth’s temperature.
Gravity hold
air around Earth A+
Mr. Fetch's Earth Science Class
Mr. Fetch’s Earth Science Classroom

3. Mr. Fetch's Earth Science Class
The Early Atmosphere
Much different than our atmosphere today.
Not suitable for life: No Oxygen to breathe and no Ozone to protect from sun’s rays.
Lots of Carbon Dioxide
Very little Oxygen
Early Atmosphere
Lots of Oxygen
More suitable for
Current Atmosphere
Mr. Fetch's Earth Science Class
Mr. Fetch’s Earth Science Classroom

4. Mr. Fetch's Earth Science Class
Eventually, organisms called Cyanobacteria started making Oxygen photosynthetically.
That oxygen was used to create Ozone.
Ozone blocked harmful rays from the sun allowing plants to survive on Earth’s surface.
Plants produce Oxygen allowing you and I to live and breathe on Earth.
The Process
Mr. Fetch's Earth Science Class
Mr. Fetch’s Earth Science Classroom

5. Mr. Fetch's Earth Science Class
Composition of the Atmosphere
The most abundant gasses in our atmosphere are:
Nitrogen
Oxygen
Argon
Carbon Dioxide
The atmosphere also contains some solids and liquids: Dust Acids Ash
Salt Water Vapor
Mr. Fetch's Earth Science Class
Mr. Fetch’s Earth Science Classroom

6. Mr. Fetch's Earth Science Class
Layers of the Atmosphere
Atmosphere is divided into different layers based on temperature.
Temperature changes as you go up.
Sometimes it INCREASES
Sometimes it DECREASES
Sometimes it STAYS THE SAME
There are 5 layers to our atmosphere, each with different characteristics:
1. Troposphere
2. Stratosphere
3. Mesosphere
4. Thermosphere
5. Exosphere
Mr. Fetch's Earth Science Class
Mr. Fetch’s Earth Science Classroom

7. Mr. Fetch's Earth Science Class
Layers of the Atmosphere
Thermosphere Temperature INCREASES High temperatures Thin air. Feels cold.
Mesosphere Temperature DECREASES
Stratosphere Temperature INCREASES Contains ozone O3 absorbs bad rays Absorption = Warm
Troposphere Temperature DECREASES. Weather occurs here.
ATMOSPHERE
Mr. Fetch's Earth Science Class
Mr. Fetch’s Earth Science Classroom

8. Mr. Fetch's Earth Science Class
Air Pressure
Air pressure is the weight of air pushing down from above.
As you go up, pressure DECREASES.
Air pressure makes air near Earth’s surface DENSE.
Mr. Fetch's Earth Science Class
Mr. Fetch’s Earth Science Classroom