The type of erosion that causes the most dramatic and visible changes in the landscape.

The answer is Gully Erosion. It is known as the least common yet would cause the most dramatic visible change in the landscape. The cuts that are deep in the soil would leave large gullies that would expand through erosion.

The type of erosion that causes the 'most dramatic' and visible changes in the landscape is the gully erosion.

Explanation:

Gully erosion is the most rapid and noticeable type of erosion. It usually occurs in valleys and in rivers with steep walls. This type of erosion is stimulated by overflowing or flooding of the river. It increases with increasing speed and pressure of the water. Gully erosion is infamous in most 'parts of the world' for washing off land forms overnight.