Ocean Regions Monday November 15, 2010

Objectives I will be able to illustrate and define the ______floor’s ___________ and ______________. I will be able to relate the theory of ________________________to the _________________on the ocean floor.

Key Points The three major regions of the ocean floor are the continental margins, the ocean basin floor and the mid-ocean ridges. The gently sloping submerged surface extending from the shoreline toward the deep ocean is called the continental shelf. At the continental margin in the Pacific Ocean there are earthquakes, volcanoes and plate activity. Seamounts are volcanoes that form on the ocean floor. Mid-ocean ridges are associated with mountainous topography. The abyssal plains are thought to be the most level places on earth. The deepest part of the ocean are ocean trenches. Seafloor spreading occurs at divergent plates.

Mapping the Ocean Floor Scientists______________________________ ________________ to map the ocean floor The three main regions of the ocean floor are 1.The ______ __ ______ ____ _ ______ _____ 2.The ______ ___ ______ ___ __ ______ ____ 3.The ______ ______ ______ ______ ______ THINK: Where have we heard about mid- ocean ridges before?

Ocean Regions Where are the continental margins, mid-ocean ridge, and ocean basin floor?

Ocean Regions Continental Margins – The zone of ______ ______ between the continent and the ocean basin floor In the Atlantic the continental margin is ______ ___and has little volcanic or earthquake activity In the Pacific oceanic crust is pushed under continental crust – What is this called? A ______ ______ ______ that causes ______ ______, ______ ______, and other ______ ______ ______

Ocean Regions Continental Margins are divided into the continental shelf, continental slope, and continental rise 1.The ______ ______ ______ is the gently ______ ______ ______ ______ that goes from the shoreline toward the deep ocean - contains important ______ ______ such as… (what were the resources we discussed on Friday?)

Ocean Regions 2. The ______ ______ ______ is a _______ gradient that leads to the deep-ocean floor - Contains submarine canyons carved out by turbidity currents 3. The ______ ______ ______ ______ is the ______ ______ ______ surface at the base of the continental slope.

Identify the different features of the continental margin

Ocean Regions The ______ ______ ______ is the area of the deep ocean floor ______ ______ ______ ______ ______ ______ ______ There are a lot cool features of the ocean basin floor – Deep ocean __ ______ ____ – __ ______ ____ plains – ______ ______ ______

Ocean Regions Deep-ocean trenches form at plate boundaries… which type of boundary do you think? – Trenches are ______ ______ ______ part of the ocean. EXPLORE THE MARIANA TRENCH Abyssal Plains are ______ ______ ______ area of the deep-ocean floor – They are the ______ ______ ______ ______ ______ ______ ______ ______ that form on the ocean floor

Ocean Regions Mid-Ocean Ridges are found near the center of most ocean basins where ______ ______ ______ meet Mid-ocean ridges are associated with ______ ______ ______ ______ ______ ______ _____

Check In Questions 1.What are the three major regions of the ocean floor? 2.Describe mid-ocean ridges. Where are they, what type of plate boundary are they associated with, what features would you see at mid-ocean ridges? 3.How is the continental margin of the Pacific different from the continental margin of the Atlantic? 4.What are the deepest parts of the ocean? 5.What are the most level places on Earth?

Ocean Regions Draw a diagram of the ocean floor and define the terms. Include all three regions of the ocean and the features listed here: Continental marginDeep-ocean trenches Continental shelfAbyssal plain Submarine canyonSeamounts Turbidity currentsMid-ocean ridges Continental riseSeafloor spreading Ocean basin floorHydrothermal vents

Vocabulary (just in case you don’t have your list from Friday) DUE FRIDAY 11/19 1. Oceanography 2. Sonar 3. Submersible 4. Continental margin 5. Continental shelf 6. Continental slope 7. Submarine canyon 8. Turbidity current 9. Continental rise 10. Ocean basin floor 11. Abyssal plains 12. Seamounts 13. Mid-ocean ridges 14. Seafloor spreading 15. Salinity 16. Thermocline 17. Trophic level 18. Photic zone 19. Aphotic zone 20. Mixed zone 21. Deep zone 22. Density 23. Plankton 24. Nekton 25. Benthos 26. Coriolis Effect 27. Abrasion 28. Seawall 29. Beach nourishment 30. Groin