Image from Panoramio is by anirka
Image from Panoramio is by ricky kaak
Image from Panoramio is by Uli.Schnakenberg
This wave shaped rock near the town of Hyden in Western Australia are known as "Wave Rock" because of the shape which looks like a high breaking sea wave. The Wave Rock is composed of granite and the total outcrop covers several hectares. The "wave" part of the rock is about 15 metres high and approximately 110 meters long.
As per Wikipedia "the shape of the rock is not caused by a wave phenomenon, rather its rounded wave-like shape was formed by subsurface chemical weathering followed by removal of the soft weathered granite by fluvial erosion, thus the weathering occurred below ground level before it was exposed. The end result is an undercut base, leaving a rounded overhang."
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Source of info: Wikipedia
It is also worthwhile to note that this phenomenon is not unique to Hyden. Similar wave rock formations can be found at Uluru (Ayer's Rock), Australia and in other parts of the World, notably in Arizona, USA, know as "The Wave".
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