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In geology, "dip" refers to the angle at which a planar feature, such as a rock layer or fault, is inclined relative to the horizontal plane. This angle is measured in a vertical plane that is perpendicular to the strike, which is the direction of the line formed by the intersection of the planar feature and a horizontal plane.1

Related geological terms include:
* Dip slope: A land surface that is inclined in the same direction and at the same angle as the underlying rocks.2
* Dip stream: A stream that flows in the direction of the geologic dip of the rocks it crosses.3
* Dip slip: The portion of fault displacement measured down the dip in the plane of the fault.4
* Dipmeter: An instrument used to determine the direction and angle of geological formation dips.5

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