. Most rocks are made of what elements?
a. quartz, granite, marble, limestone, shale, sandstone, obsidian, mica
b. lithium, nitrogen, selenium, fluorine, chlorine, antimony, gallium, tin
c. oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium

A rock is not one single, uni- form crystal. The most common elements found in Earth's crust, and therefore in the minerals and rocks that make up the crust, are oxygen and silicon, followed by aluminum and iron, and the bases: calcium, sodium, potassium, and magnesium.

Explanation:

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c. oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium

Explanation:  The most common elements found in Earth's crust, and therefore in the minerals and rocks that make up the crust, are oxygen and silicon, followed by aluminum and iron, and the bases: calcium, sodium, potassium, and magnesium.

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world bank is the correct answer.