Question

The angle between the strike line and the true dip direction of a bed is:

• A. $0^\circ$
• B. $30^\circ$
• C. $45^\circ$
• D. $90^\circ$

Hint:

Always remember: {Strike and true dip are mutually perpendicular}. If the angle is asked, the answer will always be $90^\circ$.

Answer 1

The Correct Option is D

The question pertains to the basic principles of geology related to the orientation of rock layers or beds. The concept in question is about the "strike" and "dip" of a geological bed.

• Strike Line: This is an imaginary line that runs along the point in the bed where it is horizontal. It is the line of intersection between a horizontal plane and the rock bed's plane.
• True Dip Direction: This is the direction along which the rock bed inclines most steeply from the horizontal. The true dip angle is the maximum angle of inclination from the horizontal to the plane of the bed.

The relationship between the strike and dip is crucial in geological mapping. Specifically, the angle between the strike line and the true dip direction of a bed is always perpendicular. Therefore:

• The angle between the strike line and the true dip direction is always 90^\circ.

Conclusion: Among the given options, the angle between the strike line and the true dip direction of a bed is 90^\circ.