Astronomy

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Whats the earths atmosphere made up of?
Mainly oxygen and nitrogen, also liquid water(70%), life.
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Earths diameter?
13 000km
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How much is the earth flattened by?
42km (at the poles)
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Shape of the earth?
Oblate Spheroid
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Evidence that the earths not flat?
1.Ships disappear over the horizon. 2.Satellites orbit the earth. 3.Images of earth from space.
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How many halves does the equator divide the earth into?
2 (Northern and Southern hemispheres)
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Whats latitude?
The centre of the earth and a point on the equator
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How much is the earths polar axis tilted by?
66.5 degrees to the plane on which it orbits the sun (the elliptic)
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how many times a year does the sun lie directly above the equator?
2 (21st of march and the 22nd/23rd september, these are the spring and autumnal equinoxes)
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Whats longitude?
A point on the earths surface is angular displacement east or west of the observers meridian
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Other cards in this set

Card 2

Front

Earths diameter?

Back

13 000km

Card 3

Front

How much is the earth flattened by?

Back

Preview of the front of card 3

Card 4

Front

Shape of the earth?

Back

Preview of the front of card 4

Card 5

Front

Evidence that the earths not flat?

Back

Preview of the front of card 5
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