Cis forCork

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Photo of bottle corks
Materials

Scientific name: quercus suber

Corks are used to keep bottles tightly closed. Cork is slightly elastic, so it can be squashed smaller and will then snap back to its old size, which makes it perfect for sealing bottles and jars.
Cork is made from the bark of the cork oak, which is very closely related to the common oak tree. Cork can also be used to make floor coverings, and bulletin boards or pin boards.
Stewart Butterfield / CC BY-SA