A tree mold is where an ancient tree once lived. Lava flowed around the tree, killing it. When the tree decomposes, all that is left is the shape of it as a hole in the hardened lava.
A tree mold is where an ancient tree once lived. Lava flowed around the tree, killing it. When the tree decomposes, all that is left is the shape of it as a hole in the hardened lava.