Magnetosphere

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1. You know what a magnet is.
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3. You know what a sphere is. 
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5. A golf ball is a sphere.   
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7. A well-used leather foot ball. more or less, is a sphere.
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9. You may not know that the Earth is.
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11. Is the Earth a sphere?  
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13. Yes, the Earth is a sphere, but not a perfect one.
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15. Let's think of a magnet and a sphere together - magnetosphere!
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17. What does that mean in the real world?
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19. Better still.  On the world.
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21. We need to imagine there are protecting lines as in picture 4

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22.  The Earth is not a perfect sphere because of its irregular shape and ever-changing surface: 

1. The Earth's going round or rotation makes a force, which bulges the Earth's diameter at the equator. 
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3. The Earth is not made of all the same material, but instead has regions of different solidness deep below the surface. 
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5.  Volcano activity pushes rocks into mountains and hills.

Based on this source

23

1. The Sun, Moon, and Earth are spherical because of gravity:
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3. Gravity pulls equally from all sides
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5. Gravity pulls matter towards other matter, and a sphere is the only shape that allows every point on its surface to be the same distance from the center.
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7. Gravity is stronger in larger objects
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9. The larger an object is, the more massive it is, and the stronger its gravitational pull.    source
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11. BUT - think of a balloon.  It's full of air.  We blow it larger.  Is it more massive?
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13. For parents - yes as shown if we push the balloon under water and measure the increase.  To be removed before pupils see this page.

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