1. Aim: Describe Earth’s shape, actions and spheres

2. 1) The Earth’s Shape Nearly a perfect Sphere
A Slight bulging around the Equator (oblate Spheroid)
How do we know it is round?
Ships sail beyond the horizon
Pictures from space

3. 2) The Earth’s Actions The Earth rotates (Spins) on it’s axis
It rotates 15 degrees per hour
It is tilted at a 23 ½ degree angle
1 rotation =24 hours
The Earth Revolves (Orbits) around the Sun
1 Revolution = 365 Days

4. 3) Earth’s Spheres (ESRT P.10)
Lithosphere: the thin layer of rock that covers the Earth (Crust)
Hydrosphere: Very very thin layer of water that covers the crust (Ocean)
Atmosphere: thin layer of gas that surrounds Earth. Gravity holds it in place

6. 4) Layers of the Atmosphere Pg 14 ESRT
Thermosphere
Mesosphere
Stratosphere
Troposphere
Troposphere is where all of the water vapor is and where pressure is greatest

7. ESRT pg 14

8. Review increases increases
Air pressure _______________ as you descend through the layers of the atmosphere.
Temperature _______________ as you climb through the thermosphere.
increases
increases

9. Review Troposphere Troposphere Thermosphere
Water vapor can only be found in the _____________.
Weather can only be found in the _____________.
The _____________ is our border with space.
Troposphere
Troposphere
Thermosphere