Why is the shark's back cracked?

Wind blowing is one of the important reasons for shark back cracking, which is easy to crack when exposed to sunlight or high temperature light for a long time. Therefore, in order to prevent the shark's back from cracking, it is necessary to avoid sun exposure and blowing.

Shark's back is a kind of olive core with iron core, which has high density and enough oil. It is an excellent variety of olive core.