Which landform is evidence of erosion by waves on rocky coasts?
A: sea arches
B: shallow ponds
C: U-shaped valleys
D: sand dunes
A: sea arches
The landform that is evidence of erosion by waves on rocky coasts is A: sea arches.
The correct answer is A: sea arches.
To arrive at this answer, it's helpful to have a basic understanding of how waves cause erosion on rocky coasts. Waves constantly crash against the rocky shoreline, exerting a powerful force. Over time, this force gradually wears away the rock. Erosion can take several forms, but in this case, we are looking for a landform shaped by the wave erosion on rocky coasts.
Now, let's break down the options:
A. Sea arches: These are naturally formed arches that occur when waves erode softer rock layers that are present alongside more resistant rock layers. As the softer rock erodes, it creates an opening or arch. Over time, the arch may collapse, leaving behind two separate rock formations.
B. Shallow ponds: Shallow ponds are usually not formed due to wave erosion on rocky coasts. They are more commonly found in low-lying or flat areas where rainwater accumulates.
C. U-shaped valleys: U-shaped valleys are typically formed by the movement of glaciers, not wave erosion on rocky coasts. Glaciers carve out these valleys through the process of glaciation.
D. Sand dunes: Sand dunes are formed by windblown sand deposition, usually found in coastal areas where there is an adequate supply of sand particles.
By process of elimination, sea arches are the most plausible answer as they align with the question, which asks for a landform specifically formed through wave erosion on rocky coasts.