Half Dome looms over Yosemite National Park, California. The popular idea that Half Dome is what's left of a complete dome-shaped rock formation is false. In fact, the formation never had a dome shape. The sides of Half Dome are nearly equally steep. Only the rounded top of the northwestern side gives Half Dome the illusion of being a half-dome.

Photograph by Julie Austin, MyShot
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dome
dome Encyclopedic Entry

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Encyclopedic entry. A dome is a curved formation or structure. It is shaped like half of a sphere.