| A | B |
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| Apollo Missions | The greatest amount of our information about the Moon came from data gathered by _____________ |
| Maria | large, dark, flat surface areas on the Moon formed when huge space objects collided with the Moon's surface |
| crater | a depression in the moon's surface formed by the impact of objects from space |
| phase of the Moon | the shape of the Moon as seen in the sky |
| lunar eclipse | a situation that occurs when the Sun, the Moon, and the Earth are in a straight line and the Earth's shadow falls across the Moon |
| solar eclipse | a blocking of the Sun's light that happens when Earth passes through the Moon's shadow |
| tide | the twice daily rise and fall of the water level along the shore, caused by the gravity of the Moon and Sun |
| gravity | the force of atttraction among all objects |
| highlands | light colored regions on the Moon near the lunar poles |
| valley | cigar shaped depressions on the Moon with a floor that may contain small amounts of ice |
| mountains | found around the edges of large maria and named after ranges on Earth |
| waxing phase | the phases of the moon when the lighted side of the Moon becomes more and more visible |
| waxing crescent Moon | the phase of the Moon when less than half of the Moon is lighted on the right |
| first quarter Moon | the phase of the Moon when the entire right half of the waxing moon is lighted |
| waxing gibbous Moon | the phase of the moon when more than half of the right side is lighted |
| full moon | the phase of the moon when the entire lighted side becomes visible |
| new moon | When the moon is between the Sun and the Earth and the lighted side of the Moon faces away from the Earth |
| waning phases | phases of the Moon after the full moon when we see less and less of the Moon's lighted side |
| third-quarter moon | the phase when the left half of the lighted side is visible |
| waning Crescent moon | the phase of the Moon when the lighted left side decreases until there is a new Moon |
| 29 days | the length of the cycle of the Moon's phases |
| umbra | The Moon's dark shadow |
| spring tide | the name of the tide when the high tides are higher than usual, and low tides are lower than usual |
| neap tide | the name of the tide when the high tides are lower than usual and low tides are higher than usual |
