Board Thread:Theories and Speculation/@comment-5407586-20150624095943/@comment-3279282-20150627180831

Clay is earth, that's correct. That doesn't mean that he uses the Earth sign to control it, because as I said above, the C4 moved without Deidara using the sign.

By the way, the exact wording used in that panel is "lightning-property technique" and "earth-property bomb".