The Sun is the star at the center of our solar system.
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The Moon is Earth's natural satellite.
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A globe is a round model of Earth.
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Seasons are the parts of the year with different weather (winter, spring, summer, fall).
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Angle of rays is the angle sunlight hits Earth. A lower angle spreads light out.
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An axis is an invisible line that Earth spins around.
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Elliptical means oval-shaped, like Earth's orbit around the Sun.
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The equator is an imaginary line around the middle of Earth.
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Hemispheres are the north half and south half of Earth.
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An orbit is the path an object follows around another object.
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Revolve means to move around another object (Earth revolves around the Sun).
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Revolution is one full trip around another object.
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Rotate means to spin around an axis.
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Rotation is one full spin around an axis.
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Sunlight is the light and heat that come from the Sun.
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Tilt means leaning. Earth's axis is tilted, causing seasons.
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