| A | B |
|---|
| Maria | dark areas of smooth , dry, solidified lava on the moon that reflect little light |
| craters | funnel-shaped pit at the top of a volcanic cone; bowl-shaped depression on the surface of a planetary body |
| ray | streak of displaced rock material radiating from a crater |
| perigee | oint in the orbit of a sarellite at which it is closest tho the earth |
| Apogee | point in the orbit of a satellite at which the satellite is farthest from the earth |
| spring tide | tide with maximum daily tidal range that occurs during the new and new and full moons |
| Neap tide | tide with minimum daily tidal range that occurs during the first and third quartes of the moon |
| umbra | inner cone-shaped part of the shadow cast by the earth or the moon in which sunlight is completely blocked |
| penumbra | outer part of the shadow cast by the earth or the moon in which sunlight is only partially blocked |
