Uluru. Eroded sandstone surface of Uluru or Ayers Rock in the Northern Territory, Australia. Uluru is an inselberg, a steep-sided hill of solid arkosic sandstone rock that rises out of a plain because the material around it has been eroded away. The surface of Uluru is subject to weathering and erosion also, by a combination of chemical and mechanical processes. Daily heating and cooling of the rock and the action of rainfall cause layers of rock to peel off like an onion- skin. The resulting surface is flaky in appearance. Uluru is the largest monolith in the world, rising 348 metres from the desert floor and having a circumference of about 9 kilometres.
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