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

Step 1: Understanding strike and dip.
In structural geology, the strike of a bed is the direction of a horizontal line drawn on the plane of the rock surface. The true dip is the direction of maximum slope on that plane and is measured perpendicular to the strike direction.
Step 2: Relationship between strike and true dip.
By definition, the true dip direction is always at right angles to the strike line. This is because the strike represents a horizontal line, while the true dip represents the steepest downward inclination on the same plane.
Step 3: Conclusion.
Since the true dip direction is perpendicular to the strike line, the angle between them is $90^\circ$. Hence, option (D) is correct.