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25 Cards in this Set
- Front
- Back
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aphelion
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point in the orbit of a planet at which the planet is farthest from the
Sun |
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autumnal equinox
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beginning of the fall season
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axis
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imaginary straight line running through the Earth from pole to pole
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core
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center of a planetary body, such as the Earth
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crust
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outermost zone of the solid Earth
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daylight saving time
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system in which clocks are set one hour ahead of
standard time from April to October |
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geosynchronous orbit
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orbit directly above the Earth’s equator and moving in
the direction of the Earth’s rotation |
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gravity
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force of attraction between all matter in the universe
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International Date Line
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line running from north to south through the Pacific
Ocean where the date changes from one day to the next |
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law of gravitation
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principle that the force of attraction between two objects
depends on the masses and the distance between the objects |
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magnetosphere
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a region of space that is affected by the Earth’s magnetic
field |
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mantle
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zone of rock below the Earth’s crust
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Moho
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the Mohorovicic discontinuity, boundary between the Earth’s crust and mantle
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perihelion
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point in the orbit of a planet at which it is closest to the Sun
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polar orbit
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orbit that passes over the Earth’s North and South poles
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precession
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slow circular motion of the Earth’s axis as it turns in space that
traces a circle in space every 26 thousand years |
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revolution
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movement of a planet around the Sun
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rotation
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spinning of a planet on its axis
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satellite
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object in orbit around a body with a larger mass
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seismic wave
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vibration that travels through the Earth
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shadow zone
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location on the Earth’s surface where no seismic waves or only P waves can be detected
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standard time zone
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one of 24 regions of the Earth in which noon is set as the time when the Sun is highest over the center of the region
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summer solstice
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the beginning of summer
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vernal equinox
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the beginning of spring
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winter solstice
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the beginning of winter
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