Earth Glide (Ex) A burrowing earth elemental can pass through stone, dirt, or almost any other sort of earth except metal as easily as a fish swims through water. If protected against fire damage, it can even glide through lava. Its burrowing leaves behind no tunnel or hole, nor does it create any ripple or other sign of its presence. A move earth spell cast on an area containing a burrowing earth elemental flings the elemental back 30 feet, stunning the creature for 1 round unless it succeeds on a DC 15 Fortitude save.
Earth Mastery (Ex) An earth elemental gains a +1 bonus on attack and damage rolls if both it and its foe are touching the ground. If an opponent is airborne or waterborne, the elemental takes a –4 penalty on attack and damage rolls. These modifiers apply to bull rush and overrun maneuvers, whether the elemental is initiating or resisting these kinds of attacks. (These modifiers are not included in the statistics block.)