E14.7 Erosional Processes and Shoreline Landfor Name: Section: Course: Refer to
ID: 118486 • Letter: E
Question
E14.7 Erosional Processes and Shoreline Landfor Name: Section: Course: Refer to photos earlier in this chapter to answer the following questions. (a) How did the large blocks in Figure 14.10a get into the surf zone? What is their eventual fate? Date (b) How did Morro Rock (Fig. 14.13b) become isolated from the bedrock shoreline? (c) What is the eventual fate of the sea arch in 14.10c? Examine the shoreline in FIGURE 14.14. Point Sur and False Sur are the same kind of feature and record a multistage development for this part of the California shoreline.Explanation / Answer
a) Sea stacks are amazing vertical rock formations standing in the sea that were formed entirely by wind and water. The formation process usually begins when the sea creates cracks in the headland, causing them to later collapse, and forming free-standing stacks. Eventually, the same process that created the sea stacks will also cause them to collapse.
Weathering and erosion can create caves, arches, stacks and stumps along a headland.
Caves occur when waves force their way into cracks in the cliff face. The water contains sand and other materials that grind away at the rock until the cracks become a cave. Hydraulic action is the predominant process. If the cave is formed in a headland, it may eventually break through to the other side forming an arch. The arch will gradually become bigger until it can no longer support the top of the arch. When the arch collapses, it leaves the headland on one side and a stack (a tall column of rock) on the other.
b) Morro Rock is isolated from the bedrock shorenine in the above mentioned way. Initially cave was formed due to hydraulic action, then arch was formed & finally a stack is fromed in the form of Morro Rock.
c) Caves occur when waves force their way into cracks in the cliff face. The water contains sand and other materials that grind away at the rock until the cracks become a cave. Hydraulic action is the predominant process. If the cave is formed in a headland, it may eventually break through to the other side forming an arch.
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