You need to add the multiple choice answers
The geologic time scale is made up of eons, which are divided into eras, which in turn are divided into periods. The periods are finally are divided into epochs. The basis of these divisions is the correlation between different categories of fossils and the rock layers in which they are found.
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Wisconsin is the state, and Madison is its capital.
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I believe that Tanzania produces the most gems. Tanzania is one of the most important countries for gem production. Some gemstones that have been found include Ruby, Sapphire, Garnet, Alexandrite, Emerald etc.
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Answer: is constant
Explanation:
In order to analyze the velocity of the stars within a galaxy, the <u>galaxy rotation curves</u> (developed by the American astronomer Vera Rubin) are used. These graphs are elaborated as a scatter diagram in which the orbital velocity of the stars present in a galaxy is represented on the Y axis and the distance of these stars to the center of the galaxy on the X axis.
Thanks to this diagram, it has been possible to observe a characteristic behavior in the rotation speed of the stars (and gas) present in the galaxies, which differs from the rules of the orbital movement of the planetary systems postulated by Newton and Kepler.
This means that in these galaxy rotation curves it has been observed that the rotation speed of stars and gas is "constant", regardless of the distance to the center of the galaxy. This discrepancy and these results were then used to demonstrate the existence of dark matter in the universe.
