The dome was formed millions of years ago by cooling magma, how we know its an igneous rock formation, that was slowly pushed through the surface and into the sky. The distinctive shape, from whence it is named, was caused by the glacier that created the Yosemite Valley itself. This glacier stripped away the rock on one side of the formation, leaving the sheer face on one side.
Looking at Half Dome from another angle shows that it's not as smooth of a dome shape as most pictures would indicate, but its beautiful nonetheless. The hike to the top isn't an easy one, but it does give you opportunity to closer inspect the rock itself and its condition. The best way to get a clear image of Half Dome's flat face is to free solo the face, but I'm nowhere near brave enough for THAT. Maybe next time?
On second thought, no thanks.
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