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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.

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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:

1 The Earth-Moon-Sun System (chapter 7)

2 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.

3 Continued… Ironically, the magnetic poles are not at the North/South Poles!

4 Earth’s orbit has an elliptical shape… why is that important?

5 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!

6 Why do we have seasons? 1. Earth’s rotation 2. Earth’s revolution 3. Tilt of Earth’s axis

7 The Moon’s effect on Earth Tides

8 Tide demonstration vities/predicting_tides.html#activity vities/predicting_tides.html#activity

9 Moon phases Waxing phase – as the moon grows larger each night Waning phase – as the moon grows smaller Crescent…< 25% is showing Gibbous…> 25% is showing

10

11 Solar eclipse umbra Penumbra

12 Lunar eclipse


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