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Unit 7B

Lunar Cycle & Tides Vocab. 8th Grade

TermDefinition
lunar cycle the Moon’s repeated pattern of movement and changes in appearance, caused by its revolution around Earth
moon phases the different shapes that the Moon appears to have, caused by the Moon’s orbit around Earth
waxing phases when the Moon appears to be getting larger
waning phases when the Moon appears to be getting smaller
crescent moon the shape of the Moon that is less than a quarter moon
gibbous moon the shape of the Moon that is greater than a quarter moon, but not full
full moon the entire disk of the moon is lit up and visible
first quarter moon half the disk is illuminated, and the cycle is in the waxing phases
third quarter moon half of the disk is illuminated, and the cycle is in the waning phases
new moon when the Moon is between the Sun and Earth so that none of the illuminated portion is seen from Earth
illuminated lit up
lumen the SI unit to measure brightness of light
gram the SI unit to measure mass
meter the SI unit to measure distance
Celsius the SI unit to measure temperature
liter the SI unit to measure volume (not sound)
ocean tide twice daily changes in the level of ocean water
gravitational pull attraction between two objects due to the invisible force of gravity
high tide when the tide causes the ocean to reach its greatest elevation
low tide when the tide causes the ocean to reach its lowest elevation
spring tide the largest daily tidal range, which occur when the Sun, Earth, and Moon line up
neap tide the smallest daily tidal range, which occur when the Sun, Earth, and Moon form a 90 degree angle
tidal range the difference between the heights of the high tide and the low tide in an area
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