Alvar

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

An alvar is a biological environment based on a limestone plain with thin or no soil and, as a result, sparse grassland vegetation. Often flooded in the spring, and affected by drought in midsummer, alvars support a distinctive group of prairie-like plants.

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

Image: Rmhermen, CC BY-SA 3.0, via Wikimedia Commons.