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periodic rise and fall of the water level in oceans

tidal range

the difference in levels of ocean water at high tide and low tide

spring tide

high tides will be higher than normal and low tides will be lower than normal resulting in a greater tidal range.

neap tide

high tides won't be as high as normal and low tides won't be as low as normal resulting in a smaller tidal range.


a natural or artificial body that revolves around a celestial body that is greater in mass


a celestial body that revolves around a body that is greater in mass; natural satellite


the size of the lighted part of the moon is increasing


the size of the lighted part of the moon is decreasing

solar eclipse

the passing of the moon between Earth and the sun causing the shadow of the moon to fall on Earth (EMS)

lunar eclipse

the passing of the moon through Earth's shadow at full moon (SEM)

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