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Home Q & A Board Science-Related Homework Help Physics
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ppk ppk
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12 years ago
What is the main visual difference between the lunar highlands and the lunar maria? What are the implications of this observation?
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12 years ago
The lunar highlands are very heavily cratered and the lunar maria are generally smooth. (More specifically, the maria contain only 3 percent as many craters per unit area as the highlands.)  The difference in the amount of craters shows that the maria formed after the highlands, at the end of the heavy bombardment phase of the solar system. Radiometric dating of rocks from the highlands and maria shows that the heavy bombardment phase lasted no longer than a few hundred million years.
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