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6 gr Seasons & Tides
Cyclical movement of the Sun, Earth, & Moon
| Term | Definition |
|---|---|
| equator | an imaginary line drawn around the earth equally distant from both poles; divides the northern part of earth from southern part |
| hemisphere | half of a spherical or roughly spherical body (such as a planet) |
| axis | an imaginary line about which a body rotates; the axis of the earth is tilted 23 degrees |
| rotate | to move in a circle around an axis or center; the earth takes 24 hours to make one rotation around its axis |
| revolve | move in a circular orbit around another object; the orbit of the earth around the sun takes 365.25 days for one revolution |
| direct sunlight | when the hemisphere is tilted directly towards the sun |
| summer season | the hemisphere has direct sunlight; days are longer |
| indirect sunlight | occurs when the hemisphere is tilted away from the sun |
| winter season | the hemisphere has indirect sunlight; days are shorter |
| tides | the rise and fall of the ocean levels; result of the gravitational pull of the Sun and Moon as well as the rotation of the Earth |
| high tide | the ocean water reaches its highest level |
| low tide | when the ocean water reaches its lowest level |
| spring tides | occur during new and full moon; the moon, Earth, and Sun align in a straight line; Straight line = Spring tides; result in higher high tides and lower low tides |
| neap tides | occur during 1st and 3rd quarter; the moon, Earth, and Sun are at 90 degree angles; Ninety degrees = Neap tides; results in lower high tides and higher low tides |
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NEISDSci
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