Test Exam 3 for Final SDSU Oceanography 100 Exam Questions with Verified Answers

Test Exam 3 for Final SDSU Oceanography 100 Exam Questions with Verified Answers The Coastal region - the parts of the coastal region, starting with the coast all the way to the offshore (we looked at about 6); What wave energy does to a coastal cliff over time - how? Rivers and cliff erosion? ; what about southern California sand supply? - CORRECT ANSWER-Coast: land extending inland as far as marine influence is seen (ex. SD at coast) Offshore: extends from breakers to edge of continental shelf Beach: shore and nearshore, very active Berm: dry area at foot of coastal cliff (sand) Wave-Cut Platform: flat eroded bedrock at beach, eroded by waves Notch: cave cut into sea cliff by waves Coastal region: land adjacent to the beach Coast-line: base of cliff, think of the literal line that connects the bottom of a cliff to the sand/berm Wave energy erodes cliff over time and brings sand to the beach/berm (ex. California) River runoff also bring sands to the beach/berm What's the significance of the berm?...The winter time beach vs the summer time beach, why the differences?... - CORRECT ANSWER-It is the sand on beach In winter there's a narrow berm and rocky beach because wave energy is high In summer there's a wide berm and sandy beach because wave energy is low Wave energy functions caused by season Longshore currents and longshore drift - why? what about southern CA?... - CORRECT ANSWER-Longshore Drift: drift is net movement of sand grains Longshore Current: movement of water in a surf zone Current parallel to coast because waves approach beach at an angle, move sand CA longshore currents move N to S (towards La Jolla) The 2 types of coasts and all characteristics of each (the landscapes formed); How does this tie in with Plate Tectonics?... where do we find them mostly in NA? - CORRECT ANSWER-Depositional Coast: flat coast, passive margin, subsidence (lowering, below sea level), tons of sediment deposited, deltas and barrier islands, submerging coast, ex. Louisiana, Texas, South Carolina, New Jersey, Massachusetts Erosional Coast: tectonic uplift; cliffs; headlands, sea caves, arches, stacks; marine terraces; emergent coasts; ex. California, San Diego terraces