| A | B |
|---|
| When the amount of Moon's lighted surface seen on Earth increases | waxing |
| an elongated, closed curve | ellipse |
| waning Moon phase in which only one-half of the lighted side of the Moon can be seen from Earth | third quarter |
| a round, three-dimensional object whose surface is the same distance from center all the way around | sphere |
| the changing appearances of the Moon as seen from Earth | Moon phases |
| when all of the Moon's surface that faces Earth is lit up | full moon |
| dark-colored, relatively flat regions of the Moon | maria |
| when the Moon temporarily blocks the sunlight reaching Earth | solar eclipse |
| waxing Moon phase in which one-half of the Moon's light side can be seen from Earth | first quarter |
| reached when the Sun's position is directly over Earth's equator | equinox |
| the imaginary line around which a planet such as Earth spins | axis |
| when the Moon is between Earth and the Sun and cannot be seen | new moon |
| the spinning of Earth on its axis | rotation |
| when Earth's shadow falls on the Moon | lunar eclipse |
| when the amount of the Moon's lighted side that can be seen becomes smaller | waning |
| the point at which the Sun reaches its greatest distance north or south of the equator | solstice |
| Earth's yearly orbit around the Sun | revolution |
| hollow area formed on the Moon by an object striking its surface | impact basin |
