Find-A-Feature: Vesicles

Vesicles are the small holes left behind after lava cools and turns into volcanic rock. Vesicles help geologists understand the cooling history of extrusive (volcanic rocks) because lava contains large amounts of dissolved gases that are released as the lava hardens. A similar process can be seen when bubbles created by yeast are released in the bread-baking process or when dissolved carbon dioxide is released when a can of soda is opened. What do you see around you that forms in this way?

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