Tree sap is mostly water with sugars and minerals, and like many liquids, it expands when it freezes. Gradual freezes usually don’t harm trees — even if it gradually cools to subzero — but plunging temperature swings cause uneven freezing and internal pressure. This stress can crack the bark and wood, producing what sounds like a loud pop.

Can trees really explode in the extreme cold? Rumors are spreading on social media that the frigid temperatures in the Upper Midwest this week could mean exploding trees. FOX 9's Cody Matz breaks down this viral claim.