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Earth, Sun, Moon
| Question | Answer |
|---|---|
| axis | the imaginary line that passes through Earth’s center and the North and South poles |
| craters | large round pits on the moon’s surface |
| eclipse | the partial or total blocking of one object in space by another |
| equinox | twice a year when day and night are each about 12 hours long everywhere on Earth |
| lunar eclipse | occurs at a full moon when Earth is directly between the moon and the sun |
| maria | dark, flat areas on the moon’s surface formed from huge ancient lava flows |
| meteoroid | a chunk of rock or dust in space |
| moon phases | the different shapes of the moon you see from Earth |
| neap tide | a tide with the least difference between consecutive low and high tides |
| Newton’s law of universal gravitation | states that every object in the universe attracts every other object |
| orbit | Earth’s path as it revolves around the sun |
| penumbra | the part of a shadow surrounding the darkest part |
| revolution | the movement of one object around another |
| rotation | the spinning of Earth on its axis |
| solar eclipse | occurs when the moon passes directly between Earth and sun, blocking sunlight from Earth |
| solstice | when the sun is farthest north or south of the equator |
| spring tide | a tide with the greatest difference between consecutive low and high tides |
| tide | the rise and fall of ocean water that occurs every 12.5 hours or so |
| umbra | the darkest part of a shadow |
| waning | to shrink |
| waxing | to grow |