Final answer:
Displacement occurs in geological structures when rock bodies are moved from their original positions. Reverse faults and folds, specifically anticlines and synclines, display this kind of movement, with reverse faults showing upward movement of the hanging wall and folds indicating bending and shortening of rock layers.
Step-by-step explanation:
In the context of geological structures, displacement is the movement of a body of rock from its original position. Reverse faults and folds both exhibit displacement. Reverse faults involve the hanging wall moving upwards relative to the footwall, due to compression forces. In this case, the hanging wall is displaced upwards.
Folds, such as anticlines and synclines, occur when the Earth's crust is shortened and bent during compression associated with plate tectonic convergence, leading to the displacement of rock layers. Basalts, joints, and monoclines may not necessarily indicate displacement, as basalts are a type of rock, joints are fractures with no displacement, and monoclines are a type of fold that generally reflects bending without significant horizontal displacement.