6. the earth's crust is a thicker under the oceans than under the continents b less dense and thicker under the continents than under the oceans c. equally thick everywhere d. immovable

b less dense and thicker under the continents than under the oceans

Explanation:

Oceanic crust is found under the ocean, it's about 6 kilometers thick and is destroyed in subduction zones just like the continental crust. It's composed of several layers and it differs from continental crust because it's thinner, denser, younger and with a different chemical composition (olivine, pyroxene, and amphibole).Continental crust is thicker (100 kilometers) and less dense than oceanic crust, it resists subduction and its age is 30 times the average of the ocean's age.

Considering this information we can conclude that the correct asnwer is: b less dense and thicker under the continents than under the oceans.

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5×^2+20-15 or -(5x^2-20+15)

Ibelieve it's the pacific islands