Concept:Karst topography is formed by underground water dissolving soluble rocks such as limestone.
Explanation:The words are Cliffs, Lapies, Stalactites, Sinkholes, and Stalagmites.
Lapies are solution grooves and ridges on limestone surfaces.
Stalactites hang from cave ceilings due to mineral deposition from dripping water.
Stalagmites rise from cave floors by the same dripping process.
Sinkholes are surface depressions formed when underground limestone is dissolved.
All these landforms are linked to karst processes and underground water.
Cliffs are steep rock faces formed mainly by sea-wave erosion or faulting.
They are not specifically formed by underground water action.
This makes Cliffs different from the other four.
Therefore, Cliffs is the odd one out.
Answer:Cliffs