Minerals are typically formed when molten rock, or magma, cools, or by separating out of mineral-rich water, such as that in underground caverns. In general, mineral particles are small ...
Sandbars swirl beneath Oregon Inlet in Cape Hatteras National Seashore on North ... and buff Earth's rock into ever evolving works of art—and then wash the remains into the sea.
This story appears in the October 2013 issue of National Geographic magazine ... The country is rich in minerals, mined for use in electronic devices and fought over by armed groups.
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