1. You know the drill, Page 608: The Atmosphere

2. Venus: Thick atmosphere Daytime Temp = 900°F Nighttime Temp = 820°F
Mars: Almost no atmosphere Daytime Temp = 50°F Nighttime Temp = -94°F
Mercury: No atmosphere Daytime Temp = 800°F Nighttime Temp = -280°F
Earth: Medium atmosphere Daytime Temp = 74°F Nighttime Temp = 48°F

3. Venus: Thick atmosphere Daytime Temp = 900°F Nighttime Temp = 820°F
Mars: Almost no atmosphere Daytime Temp = 50°F Nighttime Temp = -94°F
Mercury: No atmosphere Daytime Temp = 800°F Nighttime Temp = -280°F
Earth: Medium atmosphere Daytime Temp = 74°F Nighttime Temp = 48°F

5. Benefits from Our Atmosphere
Keeps planet warm… but not too warm
Prevents heat from escaping at night
Allows for water cycle
Allows for breathing (plants and animals)
Blocks some incoming radiation
Perfect for flying kites

7. The Atmosphere Is Made of…
Argon (Ar) – 1%
Oxygen (O2) – 21%
Other Gases:
Carbon Dioxide (CO2) – 0.04%
Water Vapor (H2O) – 0 to 1%
Neon (Ne) – 0.002%
Miscellaneous – <0.001%
Nitrogen (N2) – 78%

10. Exosphere
Thermosphere
Mesosphere
Stratosphere
Troposphere

11. Exosphere (basically outer space)
Thermosphere
(the last molecules)
Mesosphere (where astronauts chill)
Stratosphere (above the weather)
Troposphere (where we live)

12. Exosphere (basically outer space)
300 miles
Thermosphere
(the last molecules)
50 miles
Mesosphere (where astronauts chill)
30 miles
Ozone Layer (O3)
Stratosphere (above the weather)
7 miles
Troposphere (where we live)

13. What Happens When It’s Heated?

14. COOL
HOT

15. Uneven heating creates natural convection currents (wind), with air typically moving from cold to hot at ground-level.
COOL
HOT