The terms ‘Strike’ and ‘Dip’ are used with geology and mining to define a plane for rock slope analysis. In simple terms, strike means across the slope whereas dip means down the slope.
In more technical terms, strike is the direction of the line that is formed by the intersection of the plane of the rock bed with a horizontal surface. Dip is the direction in which the steepest angle is formed between the plane of the rock bed and the horizontal surface.