Answer:
The trees were breaking apart because the bark and outer layer of wood froze first, then the inner wood and sap froze. When the sap froze, it expanded and had nowhere to go, so the trees exploded.
Explanation:
Google Elena's diary entries.
Vempire diaries. I can't remember one off the top of my head, but if you haven't watched vampire diaries, you 100% should.
Back to the future
