Do a Google or other web search for images and maps of the continuous coastline

Question

Do a Google or other web search for images and maps of the continuous coastline of Washington and Oregon. Define this coastline in terms of the above categories as follows:

7. Is the WA/OR coast at an active or passive continental margin? Explain.

8. Would you call the WA/OR coast a primary or secondary coast? Explain.

9. Briefly describe the difference between the BC coast and the WA/OR coast as follows:

            a. Which section of the Pacific NW (BC or WA/OR) has the greater input of river water and sediments? Explain.

            b. Which section of the Pacific NW (BC or WA/OR) has the most rugged coastline, much like that of SW Ireland and SW New Zealand? Why do you think this is the case?

Explanation / Answer

7) Washington/Origon coast is at an active continental magin. The Oregon Coast Range is a belt of uplifted land lying along the Pacific Coast of Oregon. The uplift is a result of plate convergence. About 400 km west of the Coast Range lies the spreading center, which separates the Pacific plate and the Juan de Fuca plate, which descends under the North American Plate along the Cascadia subduction zone.

8) Washington/Origon coast is a primary coast. During the Oligocene (-25 million years ago), uplift of sedimentary basins in Oregon resulted in the westward migration of the coastline from as far east as Idaho towards the present position. Synchronous with uplift, giant fissures in northern Oregon brought lava flows up from the subducting plate.

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