The letters following each Review Question refer to the corresponding Learning Objective from the Chapter Opener. Describe how waves affect a rocky coast and how such coasts evolve. (F)

Short Answer

Expert verified
Waves affect a rocky coast by shaping and modifying it through processes like weathering, erosion, transportation, and deposition. Weathering breaks down rocks, making them more susceptible to erosion, which removes and transports materials from the coast, creating features like wave-cut notches, cliffs, and wave-cut platforms. Differential erosion can also lead to the formation of sea arches and stacks. Transportation and deposition contribute to the formation of beaches and other features like spits, bars, and tombolos. The evolution of a rocky coast depends on factors such as wave strength, geological structure, coastal properties, and sediment transport and deposition, ultimately leading to changes in the coastline's configuration over time.

Step by step solution

01

Introduce how waves affect a rocky coast

Waves play a significant role in shaping and modifying rocky coasts. Coastal processes mainly depend on the energy of waves, the type of sediment, and the characteristics of the rocky coastline.
02

Explain the process of weathering

Weathering refers to the disintegration and decomposition of rocks due to the combined action of water, air, and other natural agents. On rocky coasts, weathering contributes to the breakdown of rocks, which are then more susceptible to erosion.
03

Explain the process of erosion

Erosion is the process through which waves remove and transport materials from the coast. On rocky coasts, wave energy is responsible for the formation of various coastal features. For example, the continuous impact of waves against the coastline creates wave-cut notches, which are small indentations at the base of the cliffs.
04

Describe the formation of cliffs and wave-cut platforms

As erosion continues, the wave-cut notches deepen, and the overlying rock mass becomes unsupported, leading to the collapse of that section of the cliff. Over time, as the cliff continues to retreat, a flat, rock-strewn surface called a wave-cut platform is left behind.
05

Explain the formation of sea arches and stacks

As erosion continues to wear away the rocky coast, differential erosion might create weaker areas resulting in sea caves. The expansion and deepening of these caves might eventually lead to the formation of a sea arch, which is a natural rock bridge formed between two headlands. When the top of the sea arch collapses, a stack, a vertical column of rock separated from the coastline, is left behind.
06

Describe the process of transportation and deposition

Transportation and deposition refer to the movement of eroded materials along the coast due to the wave action. On rocky coasts, sediment transport often leads to the formation of beaches and other depositional features like spits, bars, and tombolos.
07

Explain the factors affecting the evolution of a rocky coast

The evolution of a rocky coast is influenced by factors such as the strength and reach of waves, geological structure, coastal properties, and the rate of sediment transportation and deposition. Over time, these processes contribute to the changes in the coastline's configuration.
08

Summarize the explanation

In summary, waves significantly impact rocky coasts and contribute to their evolution through processes like weathering, erosion, transportation, and deposition. The various coastal formations such as cliffs, wave-cut platforms, sea arches, and stacks result from these processes. The evolution of a rocky coast depends on the interplay of wave energy, rock structure, and sediment transport and deposition.

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