The compass direction of a fold or rock layer exposed at the surface along is called the strike.

Here's a breakdown:

* Strike: The compass direction of a horizontal line drawn on the surface of an inclined rock layer or fold. It's essentially the direction the layer is trending in the landscape.

* Dip: The angle of inclination of the rock layer or fold measured from the horizontal plane. It's the angle at which the layer is dipping downwards.

Together, strike and dip describe the orientation of a geological feature in three-dimensional space.