What are the causes of death caused by air crashes, and why is the survival rate of air crashes almost zero?

My personal feelings are as follows. 1 If the plane disintegrates in the air, in addition to the explosion, the human body will be exposed to cold air at high altitude and descend at a high speed, and it will freeze to death before reaching the ground, not to mention falling directly into mud. . .

It would be more painful if the plane fell to the ground instead of disintegrating in the air. Strong impact will directly break hands and feet or hurt internal organs and head, causing serious internal injuries and trauma, and slowly die. Even if you are lucky enough to have only a skin injury, the plane may catch fire and explode when landing, causing secondary injuries, and the comatose passenger may be burned to death and suffocated.

So the survival rate of air crash is very small.