Showing posts with label rock. Show all posts
Showing posts with label rock. Show all posts

Wednesday, 6 November 2019

DESKTOP 2287 - ROCK

Uluru, also known as Ayers Rock, is a large sandstone rock formation in the southern part of the Northern Territory, central Australia. It lies 335 km south west of the nearest large town, Alice Springs, 450 km by road. Kata Tjuta and Uluru are the two major features of the Uluṟu-Kata Tjuṯa National Park.

The sandstone formation stands 348 m high, rising 863 m above sea level with most of its bulk lying underground, and has a total circumference of 9.4 km. Uluru has immense cultural significance and is sacred to the Anangu, the Aboriginal people of the area. The area around the formation is home to a plethora of springs, waterholes, rock caves and ancient paintings. Uluru is listed as a World Heritage Site.

Uluru is an inselberg, literally "island mountain". An inselberg is a prominent isolated residual knob or hill that rises abruptly from and is surrounded by extensive and relatively flat erosion lowlands in a hot, dry region. Uluru is also often referred to as a monolith, although this is a somewhat ambiguous term that is generally avoided by geologists. The remarkable feature of Uluru is its homogeneity and lack of jointing and parting at bedding surfaces, leading to the lack of development of scree slopes and soil. These characteristics led to its survival, while the surrounding rocks were eroded.

This post is part of the Wordless Wednesday meme,
and also part of the ABC Wednesday meme,
and also part of the Nature Notes meme.

Sunday, 17 March 2019

DESKTOP 2054 - GREAT-GREAT-GRAND CANYON

Some seriously old rock formations in this natural wonder of nature! Nearly two billion years of Earth's geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. While some aspects about the history of incision of the canyon are debated by geologists, several recent studies support the hypothesis that the Colorado River established its course through the area about 5 to 6 million years ago. Since that time, the Colorado River has driven the down-cutting of the tributaries and retreat of the cliffs, simultaneously deepening and widening the canyon.

This post is part of the My Sunday Best meme.