A demolition bomb is an air-dropped munition designed to demolish buildings and hardened structures. Much of its weight consists of its explosive charge, and the bomb inflicts damage primarily through blast. Since blast damage is intensified inside a building, demolition bombs may use delay fuzes instead of contact fuzes, allowing their bulk to penetrate into a target before exploding. Demolition bombs are generally not used against exposed targets on open ground, as the earth may absorb and deflect the explosion, or even cause the bomb to disintegrate.