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10 Cards in this Set
- Front
- Back
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How long is one rotation of the earth on its axis? |
24 hours or one day. |
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Which way does earth spin on its axis? How fast? |
East to west on axis at ~15 degrees an hour or 1,033 miles per hour. |
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How long is one Revolution? |
365 1/4 days |
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Why do we have leap years? |
We have leap years because, after four years the 1/4 of a rotation eventually adds up to a full day, which gives us an extra day. |
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If it is winter in the Northern Hemisphere what season will it be in the southern hemisphere?
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Winter |
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Why do we have seasons? |
1. The tilt of the earth on its axis. (23.5 degrees) 2. Earth revolves around the sun. 3. The angle of the sun's rays and the # of hours of daylight. |
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What is significant about December 21? |
It is the winter solstice in the northern Hemisphere and summer in the southern hemisphere. |
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What is a vernal equinox? |
There is equal amounts of direct and indirect sunlight. |
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What is the Autumnal Equinox? |
Equal amounts of direct and indirect sunlight 1sy day of spring. |
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