In certain conditions, tree sap may reach extreme negative pressures and emit popping sounds.
via LiveScience.com http://www.livescience.com/28158-if-a-dry-tree-pops-sap-bubbles-in-the-woods.html
via LiveScience.com http://www.livescience.com/28158-if-a-dry-tree-pops-sap-bubbles-in-the-woods.html
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