How do continental crust and oceanic crust differ?
What will be an ideal response?
The oceanic crust is approximately 7 kilometers thick, and is composed homogeneously of the dark igneous rock basalt. By contrast, the continental crust averages 35–40 kilometers thick but may exceed 70 kilometers in some areas (like the Himalaya). The continental crust is also not very homogenous, though the upper part is mostly granitic there are many rock types that comprise it.
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a. magnetite b. galena c. pyrite d. halite
The auroras in the upper atmosphere are caused by
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Indicate whether the statement is true or false