Explanation: you add the number however times the number ex 2 x 2
2 + 2 = 4
The Gates include a discussion of Hume, Descartes, and other philosophers of the Enlightenment is because t<span>o explain past perceptions of race and humanity.
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The main idea of this paragraph is that the rocks cannot be explained by science, that there is a mystery to them. This sentence contributes to that idea because it gives a specific example of one of the odd things about the rocks. Because they are on a flat surface they should not roll or move on their own, but the fact that they have a trail behind them shows that they have somehow moved. This supporting statement is then supported by more details about the trails.
