Formation
The foundations for both terraces were formed from alternate layers of volcanic fallout over a long period of time. The volcanic debris layers, alternating between rhyolitic and sedimentary stone, formed the base for precipitation of silica.
The precipitation formed many pools and steps over time. Precipitation occurred by two methods. The ascending foundation over time formed a lip which would trap the descending flow and become level again. This process formed attractive swimming places, both for the shape and for the warm water. When the thermal layers sloped in the other direction away from the geyser, then silica steps formed on the surface. Both types of formation grew as silica-laden water cascaded over them, and the water also enhanced the spectacle. Geologist Ferdinand von Hochstetter wrote after his visit in 1859 that "doubtless thousands of years were required" for their formation.
The White Terraces were the larger formation, covering 3 hectares and descending over approximately 50 layers and a drop in height of 40 metres. The Pink Terraces descended 30 metres over a distance of 75 metres. The converging Pink Terraces started at the top with a width of 75–100 metres and the bottom layers were approximately 27 metres wide. The Pink Terraces were where people preferred to bathe due to the more suitable pools.
Read more about this topic: Pink And White Terraces
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