COLIN CUTHBERT / SCIENCE PHOTO LIBRARY COLIN CUTHBERT / SCIENCE PHOTO LIBRARY
Uluru or Ayers Rock in the Northern Territory, Australia, with long shadows cast by the setting sun. Uluru is an inselberg, a steep-sided hill of solid rock that rises out of a plain because of the erosion of the material around it. The surface of the rock itself has also been eroded by chemical and mechanical processes into formations such as gullies. Uluru is the largest monolith in the world, rising 348 metres from the desert floor and having a circumference of about 9 kilometres. It is made of arkosic sandstone, a type of feldspar with a high content of mineral iron. It appears to change colour from red to purple at sunset.
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