Warm Up! Take a look at the picture below. How do you think this landform was created? Write at least 3 sentences. Math EOC Practice Warm-Up: Answer! The islands you saw in the warm-up picture are The World Islands, off the coast of Dubai. They were created through a process called dredging, which removes sediment from the bottom of the ocean and deposits it elsewhere.Dubaiwatch?v=p1TcQXSK_6kwatch?v=p1TcQXSK_6k Todays Objective SWBAT explain changes in sea level and the effects of human activity on shorelines and barrier islands. Global Average Sea Level What is measured on the y-axis? What is measured on the x-axis? Where are we currently on this chart? How has the sea-level behaved in the past? What do scientists predict will happen to the sea-level in the future? Sea Levels Around the World What do you think sea levels are like around the world? Do sea levels only increase? Lets find out! Sea Levels in the United States Galveston: instead of rising water levels, the land in Galveston actually sank! What do you think caused the land to sink? Do you notice anything unusual about the trends you see in this graph? Why does this happen? Short-term causes of sea-level changes include: Waves Tides Specific flood events Why does this happen? Long-term causes of sea-level changes include: Sedimentation Erosion Groundwater and oil extraction Global warming & melting of glaciers and ice sheets Sedimentation Erosion Groundwater extraction TimeTime Changes in glaciers and ice sheets Global Warming Rising temperatures due to global warming also contribute to rising sea levels Warmer temperatures cause ice in the colder parts of the world to melt Melted ice then increases the amount of water in our oceans, and causes the sea level to rise. What does the future hold? What will rising sea-levels do to our cities?when-sea-levels-attack/when-sea-levels-attack/ What do rising sea levels look like? Lets take a look! While you watch, take down notes on how a 1 foot rise in ocean levels would affect the earth.AssetId=B3968D5B-BEF B83E-F013DA646D4EAssetId=B3968D5B-BEF B83E-F013DA646D4E Case Study: Holland Island A Disappearing Act! Sea Levels in Wilmington, NC How much are water levels increasing or decreasing each year? Features of the shoreline A shoreline is the point at which a body of water meets the land. Barrier Islands are narrow sandbars parallel to, but separated from, the coast. What must be done to protect our shorelines? Groins: barrier built at a right angle to the beach to trap sand that is moving parallel to the shore. Beach nourishment: adding large quantities of sand to the beach system Hilton Head Island, SC Groin Hilton Head Island, SC What do you notice about the land on Hilton Head Island? barrier island Hilton Head Island, SC Notice anything weird? Say hello to the crocodile! Partner Activity Now that you have an idea of what Hilton Head Island is like, flip your notes over and read the article about an event that occurred there. After reading the article, answer the questions at the end of the article. Textbook Activity Section 16.3 Read section and answer questions #1-12 on page 467 Exit Ticket 1.Name 2 short-term reasons why sea levels are changing. Explain these ideas in as much detail as possible. 2.Name 2 long-term reasons why sea levels are changing. Explain these ideas in as much detail as possible. 3.How did changing sea levels affect Holland Island? 4.How are humans attempting to slow down the effects of rising sea levels? (explain 2 different ways)