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Unit 4

Vocabulary

TermDefinition
rotation The spinning of a body, such as a planet, on its axis
day The time it takes a planet to complete one full rotation on its axis
revolution The motion of a body that travels around another body in space
year Earth completes a full revolution around the sun in 365 ¼ days, or about one year.
season Each season is characterized by a pattern of temperature and other weather trends.
equinox At an equinox sunlight shines equally on the Northern and Southern Hemispheres.
solstice the area of sunlight is at a maximum in one hemisphere and at a minimum in the other hemisphere.
satellite A body that orbits a larger body.
gravity All bodies that have mass exert a force that pulls other objects with mass toward themselves.
lunar phases As the moon revolves around Earth, the portion of the moon that reflects sunlight back to Earth changes, causing the moon’s appearance to change.
eclipse An eclipse is an event during which one object in space casts a shadow onto another.
umbra The umbra is the darkest part of a shadow.
penumbra Around it is a spreading cone of lighter shadow
Tides Tides are daily changes in the level of ocean water.
tidal range A tidal range is the difference between the levels of ocean water at high tide and low tide.
spring tides Tides that have the largest daily tidal range are spring tides.
neap tides Tides that have the largest daily tidal range are spring tides.
Created by: user-1870140
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