Explosions NEVER destroy anything, that may seem a little weird but when you think about it it makes sense. An explosion is nothing more then a rapid release of energy, and depending on how well you did in science you know that energy can never be destroyed, just transferred to other objects. Here's an example, when a bomb goes off in a desert the energy is quickly released onto the sand, the sand is then heated and a crude form of glass is created, then the energy would simply spread apart into the atmosphere until we couldn't notice it anymore, nothing was destroyed, states of matter were briefly changed but everything that was there is still there. Explosions can also combine or break up molecules, to become new things, so a very large explosion involving oxygen and hydrogen has a chance of becoming water, and a very large explosion involving water could break it up turning it to it's original states. I cannot explain everything in the universe, no one can, and I may not be explaining this correctly but you get the gist.