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Handout 19-2

Handout 19-2. Features of the Ocean Floor . 1. The shallow sea floor between the shoreline and the deep-ocean bottom is called the. a . continental margin. . 2. Continental margins are made up of continental crust. b. and a thick wedge of sediment.

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Handout 19-2

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  1. Handout 19-2 Features of the Ocean Floor

  2. 1. The shallow sea floor between the shoreline and the deep-ocean bottom is called the • a. continental margin.

  3. 2. Continental margins are made up of continental crust • b. and a thick wedge of sediment.

  4. 3. The part of the continent covered by water is called the • c. continental shelf.

  5. 4. The continental shelf slopes gently from the shoreline, and drops about 0.12 m every • b. 100 m.

  6. 5. the average depth of the water covering a continental shelf is about • b. 60 m.

  7. 6. The continental shelf is part of the • a. continental margin.

  8. 7. V-shaped valleys in the continental shelf and continental slope are called ___________. • submarine canyons

  9. 8. What is one place submarine canyons are often found? • Near the mouth of major rivers.

  10. 9. How can turbidity currents help form submarine canyons? • Turbidity currents carry sediment down the continental slopes.

  11. 10. How do turbidity currents form? • When earthquakes cause underwater landslides • When large sediment loads run down a slope

  12. 11. What is the name of the deepest place in Earth’s crust? • The Mariana Trench

  13. 12. Where is the deepest place in Earth’s crust located? • The Western Pacific Ocean

  14. 13. About how deep is the deepest place in Earth’s crust? • More than 11,000 meters deep • 36,089 ft. • 6.8 miles

  15. 14. In the deep-ocean basins, what is a trench? • A long, narrow and steep depression that forms on the oceanfloor.

  16. 15. How do trenches form in the deep-ocean basins? • Trenches form in deep ocean basins as a result of subduction of a tectonic plate.

  17. 16. About half of the deep-ocean basins are covered by _______­­­­­___. • Abyssal plains

  18. 17. The flattest regions on Earth are ____________ • Abyssal plains

  19. 18. Layers of fine _________ cover the abyssal plains. • sediment

  20. 19. How does the age of the oceanic crust affect the thickness of sediments on the abyssal plains? • Older crust is generally covered with thicker sediments than younger.

  21. 20. The most prominent features of ocean basins are _________. • mid-ocean ridges.

  22. 21. Mid-ocean ridges form underwater ________. • mountain ranges.

  23. 22. What is one place where a mid-ocean ridge rises above sea level? • Iceland

  24. 23. Where do seamounts form? • Near hotspots • Areas of increased volcanic activity

  25. a. an area of increased volcanic activity where seamounts form b. submerged seamount with a flat top c. a seamount that rises above the ocean d. an oceanic island that is in the process of being eroded into a guyot e. submerged volcanic mountain taller than 1 km 24. guyot 25. hot spot 26. seamount 27. atoll 28. oceanic island

  26. The End!!!

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