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CHCS ES Ch2A
CHCS Earth Science Chapter 2 (p 29-31)
Question | Answer |
---|---|
theory | a hypothesis that has been tested and is a workable description of a phenomenon |
law | a scientific theory that has become well established because it has been repeatedly confirmed by experimentation, has made many accurate predictions, or is readily accepted by the majority of scientists |
geocentric theory | AKA Ptolemaic Theory; has earth as at the center of the solar system |
eccentric | "off center" circle |
retrograde motion | the optical illusion that some planets slow down, stop, and back up in their orbits |
epicycles | small circles that were added to the geocentric theory to explain retrograde motion |
deferent | crystal spheres that moved around earth, each having a planet, the moon , or the sun |