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Science 8
8.7B-C Lunar Cycle
Term | Definition |
---|---|
Lunar Cycle | the moons repeated pattern of movement and changes in appearance due to its position relative to the Earth and Sun |
Moon Phase | the different shapes that the Moon seems to have as seen from Earth caused by the Moon's orbit around the Earth |
Waxing | growing or getting larger |
Waning | weakening or growing smaller |
Crescent Moon | shape of the Moon that is less than the quarter moon |
Gibbous Moon | shape of the Moon that is greater than the quarter moon, but not a full |
Full Moon | entire disk illuminated |
First Quarter Moon | half of the disk is illuminated, and the cycle is in the waxing phase |
Third Quarter Moon | half of the disk is illuminated, and the cycle is in the waning phase |
New Moon | the phase when the moon is between the Sun and Earth, and none of the illuminated portion is seen form Earth |
Ocean Tide | daily changes in the level of ocean water |
Gravitational Pull | the attraction between two objects due to the invisible force of gravity or the gravitational pull from the Moon that is primarily responsible for the tides that form on the Earth |
High Tide | when the tide is at its greatest elevation |
Low Tide | when the tide is at its lowest elevation |
Spring Tide | tides with the largest daily tidal range, which occur when the Earth, Moon, and Sun line up with each other |
Neap Tide | tides with the smallest daily tidal range which occur when the Earth, Moon, and Sun form a 90 degree angle |
Tidal Effect | the force of gravity is not uniform across an object; it is stronger on the side closer to the attracting object and weaker on the side farther from the attracting objects; causes the tides |