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Chapter 11 vocab.

S-E-M

TermDefinition
Sphere A round 3 dimensial object whos axis is equal at each point. Earth is sphere.
Axis imaginary vertical line that cuts through the center of Earth spins.
Rotation Spinning of Earth in its imaginary axis, which takes about 24 hours to complete and causes day and night to occur.
Revolution Earths year long elliptical orbit around the sun.
Ellipse Elongated closed curve that describes Earth's yearlong orbit around the sun.
Solstice Twice-yearly point atwhich the sun reachs it greatest distance north or south of the equator.
Equinox twice yearly0time-each spring and fall-when the sn is directly ver the equator and he number of daylight and nighttime are equal worldwide.
Moon Phase Change in appearance of the moon as viewed from the earth, due to the relative postions of the moon, earth and sun.
Waxing Describes pahses following a new moon, as more of the moon's lit side becomes visible.
New moon Moon phase that occurs when the sun moon is between earth and the sun. At which point the moon cannot be seen because its lit halfis facing the sun.
Full Moon Phase that occurs when all of the moon's surface facing eartg reflects light.
Waning describes phases that occur a full moon as the visible lighted side of the moon grows smaller.
Soar Eclipse Occurs when moon's passes diertcly between the sun and earth and casts a shadow over a part of the earth.
Lunar Eclipse occurs when earth shadow falls on the moon.
Maria dark-colored reatvely flat regions of the moon formed when ancient lava reached the surface and filled craters on the moon's surface.
Impact Basin a hollow left on the surface of the moon caused by an object striking its surface.
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