6 Warm up Wrap up 7 4, 6 Warm up Wrap up 1,3,7 Greenhouse effect.
Warm Up!
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Transcript of Warm Up!
Warm Up!Take a look at the picture below. How do you think this
landform was created? Write at least 3 sentences.
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.
http://www.youtube.com/watch?v=p1TcQXSK_6k
Today’s ObjectiveSWBAT explain changes in sea level and the effects of human activity on shorelines and barrier islands.
Global Average Sea LevelWhat 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 WorldWhat do you think sea levels are like around
the world?Do sea levels only increase?Let’s find out!
http://tidesandcurrents.noaa.gov/sltrends/sltrends.html
Sea Levels in the United StatesGalveston: 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:
WavesTidesSpecific flood events
Why does this happen?Long-term causes of sea-level changes include:
SedimentationErosionGroundwater and oil extractionGlobal warming & melting of glaciers and
ice sheets
Global WarmingRising 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?http://www.informationisbeautiful.net/
visualizations/when-sea-levels-attack/
What do rising sea levels look like?Let’s take a look!While you watch, take down notes on how a 1
foot rise in ocean levels would affect the earth.
http://player.discoveryeducation.com/index.cfm?guidAssetId=B3968D5B-BEF5-4495-B83E-F013DA646D4E
Features of the shorelineA 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
Partner ActivityNow 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.
Exit Ticket1.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)