Aim: Describe Earth’s shape, actions and spheres

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

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

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

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

ESRT pg 14

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

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