What are the differences between monocline and syncline?

Monoclines and synclines are both types of geological folds, but they differ in structure. A monocline is characterized by a single, steeply dipping layer of rock that transitions to horizontal layers above and below, creating a step-like appearance. In contrast, a syncline is a fold where rock layers arch downward, creating a trough-like structure with the youngest rocks at the center. Essentially, monoclines involve a simple flexure of layers, while synclines represent a more complex folding of the earth's crust.