Discussion
Continental crust averaging 35 km against oceanic crust of 7 km is thicker by a factor of
Answer: A
Correct answer: 5
\[ \frac{35}{7} = 5. \] The contrast is fundamental: continental crust is thick, old, low in density and granitic, while oceanic crust is thin, young, denser and basaltic. That difference in density and thickness is what keeps the continents standing above sea level.
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