#skyline arch

[johbeil]

Skyline Arch

Arches National Park, Utah. 2010 photo taken with a Sony Ericsson W810i cell phone.

[rabbitcruiser]

Red and Green

What do you think about my pic?  

[thomaswaynewolf]

[itslandscapess]

PicsArt

[500pxpopular]

afternoon by naber1981

[jmpphoto]

Skyline Arch by James Marvin Phelps Via Flickr: Skyline Arch Arches National Park Moab, Utah November 2015 Framed by fiery red rock and endless blue sky, Skyline Arch stands tall in the heart of Arches National Park. Once a small opening, a massive rockfall in 1940 doubled its size—proof that even stone landscapes are always changing.

[stillebesat]

Skyline Arch, Arches National Park

[rabbitcruiser]

Skyline Arch Trailhead, Arches National Park (No. 2)

Why are there so many arches at Arches?

Arches National Park has the densest concentration of natural stone arches in the world. There are over 2,000 documented arches in the park, ranging from sliver-thin cracks to spans greater than 300 feet (97 m). How did so many arches form?

First, you need the right kinds of rock.

Sandstone is made of grains of sand cemented together by minerals, but not all sandstone is the same. The Entrada Sandstone was once a massive desert, full of shifting dunes of fine-grained sand. The grains are nearly spherical so, when packed together, they formed a rock that is very porous (full of tiny spaces).

In contrast, the Carmel layer just beneath the Entrada contains a mix of sand and clay. Clay particles are much smaller than sand grains; a lot of them can pack together and fill in gaps between the sand grains, making the rock denser and less porous than a purer sandstone.

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