Which type of wave travels along the surface of the Earth?

The correct choice is Surface Wave, which is a type of wave that travels along the interface between different media, specifically along the surface of the Earth. Surface waves are characterized by their ability to cause motion in the ground and are commonly observed in the context of earthquakes, where they lead to the lateral shaking of structures.

When we consider ground waves, they typically refer to radio waves that follow the Earth's curvature and can travel over larger distances by following the contour of the Earth. This narrative is aligned with radio communication but does not specifically refer to a wave that moves along the immediate surface itself, which is a distinct characteristic of surface waves.

In contrast, sound waves are mechanical waves that require a medium (like air, water, or solids) to travel through, and while they may interact with the Earth, they do not inherently travel along its surface in the way surface waves do.

To summarize, surface waves are specifically known for their behavior along the Earth's surface, making them the most fitting answer for this question.