- Compare ocean ridges with fault block mountains??

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How to find the center of an ellipse given a vertex and a focus? The area of a trapezoid with height 10 and bases 9 and 13 is ? Two similar pyramids have base edges of 6 and 9. If the total area of the smaller pyramid is 60, then the total area of the larger pyramid ? What happens when all hydrogen nuclei in the core of the star is converted into helium nuclei? P(x)=-0.2x^2+420x-17000?