Solar pond

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A solar pond is a pool of saltwater which collects and stores solar thermal energy. The saltwater naturally forms a vertical salinity gradient also known as a "halocline", in which low-salinity water floats on top of high-salinity water.

Excerpt from the Wikipedia article “Solar pond”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: This image was taken by the NASA Expedition 19 crew, Public domain, via Wikimedia Commons.