Final answer:
Anticlines and synclines are folds in rock that are created by compressional stresses. An anticline has the oldest rocks at the center and the youngest rocks on the outside, while a syncline has the youngest rocks at the center and the oldest rocks on the outside.
Step-by-step explanation:
Anticlines and synclines are types of folds in rock that are created by compressional stresses. An anticline is a fold in which the oldest rocks are at the center and the youngest rocks are on the outside, while a syncline is a fold in which the youngest rocks are at the center and the oldest rocks are on the outside. These folds form when the Earth's crust is compressed during plate tectonic convergence.