oceans process coastal processes. nauset beach, cape cod
TRANSCRIPT
Oceans Process
Coastal Processes
NAUSET BEACH, CAPE COD
DO NOW: LIST 5 THINGS YOU KNOW
ABOUT OCEANS...
HOW DO OCEANS AFFECT EARTH’S SURFACE?
• Over 71% of earth’s surface is covered with ocean water
• Average oceanic depth is around 4km(that’s higher than Mt. Everest)
• Most of the sediment on land will erode into the oceans
• Sodium chloride is the most common salt found in the ocean-others include Mg, Ca, and K)
• If ocean water evaporates, the salt concentration will rise and precipitate out of solution (sedimentary rock)
Salt Pillars
• Longshore Transport: transport along shoreline due to waves-erodes shoreline
• Waves: caused by wind
How does the ocean water transport sediment?
Waves
• Wind pushes water into a wave (oscillates)
• The wave flattens out with decreasing depth
• Breaks when the top of wave is too far ahead of bottom
• Jetty: these are man made structures used to prevent beach erosion
Beach Structures due to Geologic Activity
• Barrier Islands-carved out by waves
• Sand Bar-deposit of sediments due to wave action
• Terraces: raised beach due to crustal uplift
• Baymouth Bar-formed by Longshore current closes off bay
• Spit: formed by longshore current -opened
• Wave Cut Cliff