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'''Devils Tower''' is a monolith and popular tourist attraction in the state of [[Wyoming]], rising 1267 feet above the nearby above the Belle Fourche River, with the summit 5,112 feet above sea level.<ref>http://www.nps.gov/deto/</ref> It was declared America's first national monument by [[Theodore Roosevelt]] in 1906.

'''Devils Tower''' is a monolith and popular tourist attraction in the state of [[Wyoming]], rising 1267 feet.<ref>http://www.nps.gov/deto/</ref> It was declared America's first national monument by [[Theodore Roosevelt]] in 1906.

Devils Tower was formed by molten igneous rock forcing its way into the area's sedimentary rock, cooling before reaching the surface, and the sedimentary rock being eroded away.<ref>http://www.nps.gov/archive/deto/geology.htm</ref> Scientists have debated for many years exactly what process brought the molten igneous rock up. One early explanation was that it was the remains of a laccolith - a mushroom-shaped underground formation. Another theory is that Devils Tower is the remains of a volcano, though no other evidence of volcanic activity has been found in the area.

Devils Tower was formed by molten igneous rock forcing its way into the area's sedimentary rock, cooling before reaching the surface, and the sedimentary rock being eroded away.<ref>http://www.nps.gov/archive/deto/geology.htm</ref> Scientists have debated for many years exactly what process brought the molten igneous rock up. One early explanation was that it was the remains of a laccolith - a mushroom-shaped underground formation. Another theory is that Devils Tower is the remains of a volcano, though no other evidence of volcanic activity has been found in the area.