What characterizes a sea cave?

A sea cave is primarily characterized by its formation through erosion caused by tidal forces, waves, and the continuous action of ocean currents. Over time, the relentless force of water erodes the rock along coastlines, often creating these hollowed-out areas within cliffs and coastal formations.

This erosion is particularly effective in areas where the rock is softer or more susceptible to the pressures exerted by the waves. The constant force of the water not only shapes the cave but can also lead to further geological changes, making erosion the primary driver in the creation of sea caves.

Other geological processes mentioned in the options do not contribute to the formation of sea caves. Volcanic activity, for instance, typically results in different structures such as lava tubes, while coral structures are formed by biological processes involving marine organisms. Sedimentation processes lead to the accumulation of particles and are not involved in the creation of erosional features like sea caves. Thus, the erosion from tidal forces is a defining characteristic, making the selected answer accurate.