Structural Geology MCQ with answer and solution

Concept

Geological Folds

Formula

N/A

Step-by-step solution

1. Read the question regarding a geological fold bent upwards like an arch. 2. Recall that a fold with rock layers curving upward to form an arch shape is called an anticline. 3. Compare with the given options and select Option (a) as the correct choice.

Explanation

An anticline is a type of fold in rock layers that curves upward, forming an arch-like shape. In an anticline, the rock layers dip away from the center, and the oldest layers of rock are located at the core of the fold.

Shortcut

To easily remember the difference between geological folds: - Anticline: Arches Upward like the letter "A" (A = Anticline). - Syncline: Sinks Downward like a "U" shape or a basin (S = Sinks).

Common mistake

A common mistake is selecting Option B (Syncline) by confusing an upward-arching fold with a downward-curving trough. A helpful memory aid is that an Anticline forms an "A" shape (arched upwards), whereas a Syncline sinks downward like a basin or "U" shape.