1. Lagoon

2. Atlantic Cross-Section
Passive plate margins
No active tectonic boundaries

3. Continental Shelf Slope: - leads into deeper water, steeper gradient
- avg 370 ft/ mile
- marks the true edge to a continent
Rise:
- slope merges into a more gradual incline
- gradient of ft/mile
- rise may extend for a hundred miles or more into the deeper ocean
- consists of sediment moved downslope from the shelf to the deep ocean
- sediment delivered here by turbidity currents moving down the slope, which follow submarine canyons
Shelf:
- avg 50 miles wide and 425 ft deep
- gradient of 1/10 of one degree (10 ft/mile)
- shelves represent 7.5 % of the oceans area.
- usually contain important mineral and petroleum deposits & fish.
- evidence of sea level change
- drilling & dredging has produced remains of animals abundant during
the last ice age when sea levels were much lower.
- usually consists of sediment washed off continent by rivers/streams

4. Active Margin
Active tectonic boundary

5. Trenches
Show us the location of subduction zones

6. MOR

7. Pillow Basalts

8. Black Smoker Diagram
Entire ocean recycles
every 6-8 million yrs!

9. Hydrothermal Sea Vents
Bacteria oxidize H2S (ingest it) chemically. Independent of the sun. Chemical photosynthesis.
Tube worms eat bacteria, clams, fish eat tube worms, etc.
Unique ecological system on our planet -- doesn’t need the sun’s heat.

11. Europa
Warm ocean

12. Volcanic Island

13. Island Pic

14. Volcanic Island Subsidence plus erosion; barrier reef
continually builds and remains in the
same place.

15. Barrier Reefs

16. Volcanic Island Island eventually erodes away leaving behind
the reef, now called an Atoll.

17. Atolls

19. Wave

20. Wave Movement

23. Tsunami

24. Longshore Current

25. Longshore Pic

26. Beach Storm Response Summer: No storms. Steep beach.
Winter: Storms interact with dunes, move
sand offshore onto bars. Flat beach, wavecut dunes.
Bars march back up to shore and dock onto beach
over period of days or months, forming steep beach.

27. Barrier Islands

28. Barrier Island Pic

29. Tidal Channel

30. Baymouth Bar

31. Jetty

32. Groin Pic

33. Groin Pic

34. Groin Field

35. Prestorm

36. Poststorm

37. Seawall

38. Seawall Erosion

39. Seawall Erosion

40. Prereplenishment

41. Postreplenishment

42. 1967 Development

43. 1997 Development

44. Sea Level Rise

45. Sea Level Rise Pic

46. Western Headward Erosion

47. Wavecut Cliff

48. Sea Arch

49. Sea Stack

50. Wavecut Beach