Question

Which one of the following is not the characteristic of a syncline fold?

• A. The limbs (sides) of the fold dip inward towards the central hinge or axis
• B. Synclines are the result of compressional forces pushing rock layers downward
• C. A downward-bending fold or downfold, that forms a U-shaped trough
• D. The oldest rocks are pushed up to the core (center)

Hint:

A syncline is a downward-bending (concave up) fold that looks like a trough or U-shape. Identifying its true characteristics helps spot the one statement that does not belong.

Answer 1

The Correct Option is D

Step 1: Picture a syncline.
A syncline is a downfold shaped like a U or trough, concave upward.

Step 2: Check the limb statement.
Its limbs dip inward toward the central hinge. That is a true feature of a syncline.

Step 3: Check the force statement.
Synclines form by compression pushing rock layers down. True.

Step 4: Check the U-shape statement.
A downward bend forming a U-shaped trough describes a syncline correctly. True.

Step 5: Check the rock-age statement.
In a syncline the youngest rocks sit at the centre and the oldest on the outside. The claim that the oldest rocks are pushed up to the core describes an anticline, so it is false for a syncline.

Step 6: Choose the answer.
The statement that is NOT a syncline feature is option 4.
\[ \boxed{\text{The oldest rocks are pushed up to the core (center)}} \]