HCHS Earth Science- Earth and the Moon
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Created by:
tlazzaro11 Plus on November 8, 2011
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24 terms
Terms | Definitions |
|---|---|
 Axis |  an imaginary line that passes through Earth's center and the north and south poles, about which Earth rotates |
| Rotation |  the spinning motion of a planet on its axis |
| Revolution | the movement of an object around another object |
| Orbit | The path of an object as it revolves around another object in space. |
| Perihelion |  The point in a planet's orbit at which the planet is closest to the sun. |
| Aphelion | the point in a planet's orbit that is farthest from the sun |
| Zenith | The point in which the sun is directly overhead. |
| Solstice | The two days of the year on which the sun reaches its greatest distance north or south of the equator; June 21 and Decemeber 21 |
| Equinox | the two days of the year on which neither hemisphere is tilted toward or away from the sun |
| Phases |  one of the different apparent shapes of the moon as seen from Earth |
| Crescent | the shape of the moon when less than half full |
| Gibbous | the moon phase in which we see more than half, but not all, of the moon's sunlit side |
| Waxing | (of the moon) pertaining to the period during which the visible surface of the moon increases |
| Waning | (of the moon) pertaining to the period during which the visible surface of the moon decreases |
| Solar Eclipse |  the blocking of sunlight to earth that occurs when the moon is directly between the sun and earth |
| Lunar Eclipse |  the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon |
| Umbra | the darkest part of a shadow |
| Penumbra | the part of a shadow surrounding the darkest part |
| Tides | the daily rise and fall of Earth's waters on its coastlines |
| Spring Tide |  a tide with the greatest difference between high an low tide that occurs when the sun and the moon are aligned in a line with Earth |
| Neap Tide |  a tide with the least difference between high and low tide that occurs when the sun and moon pull at right angles to each other |
| Maria |  dark, flat areas on the moon's surface formed from huge ancient lava flows |
| Highlands | tall mountain ranges and appear as light areas on the moon |
| Craters |  A large round pit caused by the impact of a meteoroid. |
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