Presentation on theme: "The Earth-Moon-Sun System (chapter 7). Points of note…. Earth is a sphere. Gravity causes large objects (planets) to form spheres. Earth has a magnetic."— Presentation transcript:
The Earth-Moon-Sun System (chapter 7)
Points of note…. Earth is a sphere. Gravity causes large objects (planets) to form spheres. Earth has a magnetic field that protects us from solar radiation.
Continued… Ironically, the magnetic poles are not at the North/South Poles!
Earth’s orbit has an elliptical shape… why is that important?
Time and Seasons The Earth is spherical… and can be divided into It spins (rotates) in ~ 24 hours How many degrees does it turn in 1 hour? This is also the width of a time zone (15 o )! The International Date Line – the location where a day is added/subtracted Revolution – Earth’s motion around the Sun Remember…it’s elliptical!
Why do we have seasons? 1. Earth’s rotation 2. Earth’s revolution 3. Tilt of Earth’s axis