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10 Cards in this Set

  • Front
  • Back
axis
imaginary vertical line that cuts through the center of Earth and around which Earth spins.
ellipse
elongated, closed curve that describes Earth's yearlong orbit around the sun.
equinox
twice-yearly each time spring and fall come when the sun is directly over the equator and the number of daylight and nightime hours are equal worldwide.
full moon
phase that occurs when all of the Moon's surface facing Earth reflects light.
impact basin
a hollow left on the surface of the moon caused by an object striking it's surface.
lunar eclipse
occurs when the earth's shadow falls on the moon.
maria
dark-colared, relatively flat regions of the moon formed when ancient lava reached the surface and filled craters on the moon's surface.
moon phase
change in apearance of the moon as viewed from Earth, due to the relative positions of the moon, Earth, and sun.
new moon
moon phase that occurs when the moon is between Earth and sun, at which point the moon cannot be seen because its lighted half is facing the sun and its dark side faces Earth.
revolution
earth's yearlong elliptical orbit around the sun.