# Does the barbarian rage ability 'Ground Breaker' work on plain earth?

Does the barbarian rage ability 'Ground Breaker' work on plain earth or other floor surfaces that have a hardness of zero?

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Is plain earth really listed as having Hardness 0? I would imagine that its Hardness would have to be quite high in order prevent just sinking into it. It's certainly quite a lot of work to dig into... – KRyan Apr 9 '13 at 15:18
@KRyan That was my thinking too, but the substances table didn't cover it. d20pfsrd.com/equipment---final/… – MadMAxJr Apr 9 '13 at 18:39