About burrow speed

[Vaahama]

Somehow i did not found any reference about what exactly can we burrow through! Soft earth, loose soil, solid rock, any kind of ground?

More precisely i'm thinking about a sorcerer with the elemental (earth) bloodline wich as burrow 30'.

Thanx

[Jeff1964]

Well, under Earth subtype, it says that most Earth creatures can burrow through solid rock. I would say that an Earth bloodline, with a link to the elemental plane of Earth, would be able to as well.