Formative Assessment #1 Unit 1 Module 2 This image shows part of the Oregon coas

Question

Formative Assessment #1 Unit 1 Module 2 This image shows part of the Oregon coast of the western This image is from along the Louisiana coast in the southeastern United States. The black area at the shoreline is where marsh grass caught fire (image source M. Kulp) 1.2a) Why is the area in the foreground of the Oregon coast image not vegetated? 1.2b) What is the likely source of the large boulders in the foreground of the Oregon coast image? 1.2c) What most likely happens to the sand that fronts the Louisiana coast when a large storm such as a tropical cyclone passes over the coast? 1.2d) Other than sand, silt, and mud what other type of detrital material is probably in high abundance along the Louisiana coast?

Explanation / Answer

1.2a) The area is not vegetated because of the erosive action of the river. Erosion hinders the growth of vegetation.

1.2b) The most likely source of the large boulders are the mountains near Oregon Coast.

1.2c) When a large storm passes over the coast, there is a sand storm.

1.2d) The other detrital deposits are monominerallic rocks and lithic fragments.

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