Bomb-Rocks are explosive rocks in the Pikmin games. In the first game, they could be carried by Yellow Pikmin, where their main purposes were to destroy rock walls. They could also be used to defeat enemies. In the second game, however, they were much larger and can not be carried, (with the exception of when you are in the the Hostile Territory stage in 2-Player Mode you can pick them up with your pilots) only detonated. In certain dungeons, they can actually be eaten by any nearby Emperor Bulblaxes (on its own) in the area. They are also produced by Careening Dirigibugs. Volatile Dweevils are also capable as acting as moving bombs. NEVER throw Purple Pikmin on these. Bomb-rocks can even be petrified, so do that if you are in a pinch, but keep in mind that they will not release nectar or spray.
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A few bomb-rocks in a can, these can be used by yellows. This is from the first Pikmin, so these aren't the bomb-rocks that are used by enemies.