I have noticed that when I burn a wood log in my fireplace, the log will soon take on a kind of 'alligator' pattern, with stripes (cracks!) somewhere between half an inch to an inch apart. See picture:
I have 2 questions:
Why are the cracks always straighht along the log, or perpendicular to it? Why not diagonal?
Why is the spacing fairly consistent at between half to one inch : why is that? Is this because of something in the wood log, is it some kind of stable attractor, or ...?
P.s. Not sure what tags to use here ... Or if this is even the right site for this question ...-