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The Earth-Moon-Sun S
Unit 4
| Term | Definition |
|---|---|
| rotation | rotation the spin of a body on its axis. |
| Day | 24 hours |
| Revolution | the motion of a body that travels around another body in space; one complete trip along an orbit. |
| year | 365 days |
| Season | a division of the year that is characterized by recurring weather conditions, and determined by both Earth’s tilt relative to the sun and Earth’s position in its orbit around the sun |
| equinox | the moment when the sun appears to cross the celestial equator |
| solstice | he point at which the sun is as far north or as far south of the equator as possible |
| satellite | a principle that states that younger rocks lie above older rocks if the layers have not been disturbed |
| Gravity | A force of attraction between objects that is due to their masses and the distance between them. |
| Lunar Phases | The different appearances of the moon from Earth throughout the month as it revolves around our planet. |
| Eclipse | An event in which the shadow of one celestial body falls on another. |
| Umbra | a shadow that blocks sunlight, such as the conical section in the shadow of the Earth or the moon |
| Penumbra | the outer part of a shadow such as the shadow cast by Earth or the moon in which sunlight is only partially blocked |
| Tide | The periodic rise and fall of the water level in the oceans and other large bodies of water. |
| Tidal Range | The difference in levels of ocean water at high tide and low tide. |
| Spring Tide | A tide of increased range that occurs two times a month, at the new and full moons, when the sun, moon, and Earth are aligned. |
| Neap Tide | A tide of minimum range that occurs during the first and third quarters of the moon, when the sun and moon are at right angles to each other. |