CHCS Earth Science Chapter 2 (p 29-31)
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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theory | a hypothesis that has been tested and is a workable description of a phenomenon
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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
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geocentric theory | AKA Ptolemaic Theory; has earth as at the center of the solar system
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eccentric | "off center" circle
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retrograde motion | the optical illusion that some planets slow down, stop, and back up in their orbits
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epicycles | small circles that were added to the geocentric theory to explain retrograde motion
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deferent | crystal spheres that moved around earth, each having a planet, the moon , or the sun
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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