D Data: information or material that serves as a basis for discussion and analysis. Deformation: process where rocks are folded, faulted, sheared or compressed by Earth stresses. Dip: the angle by which a rock layer or fault plane deviates from the horizontal. The angle is measured in a plane perpendicular to the strike. Dip-slip Fault: a fault in which the relative displacement is along the direction of dip of the fault plane; the offset is either normal or reverse. Displacement: overall change in position from start to finish. Distance: the amount of space between two points. Divergence: driving or moving apart from a common point.