Which landform is evidence of erosion by waves on rocky coasts?(1 point)
Responses
sand dunes
U-shaped valleys
shallow ponds
sea arches
sea arches
The correct answer is sea arches.
The landform that is evidence of erosion by waves on rocky coasts is sea arches. To arrive at this answer, we can consider the process of wave erosion on rocky coasts. Waves continuously crash against rocky cliffs and wear them down over time. This process primarily occurs due to the mechanical action of hydraulic pressure, abrasion, and attrition.
As waves repeatedly hit the cliffs, they forcefully compress air into cracks in the rock, causing them to expand. This expands the cracks, eventually causing chunks of rock to break away. Over time, these repeated impacts and rock breakages lead to the formation of sea arches.
Sea arches are natural arches formed by the erosion of sea caves. As waves hit the coastline, they gradually erode softer rock layers, creating caves that extend into the cliffside. As the erosion continues, the waves hollow out the center of the cave, forming an arch. Eventually, the arch can collapse, leaving behind a stack or a separate rock formation. These sea arches are a remarkable testament to the power of wave erosion on rocky coasts.
So, the correct response to the question is "sea arches."