1. Lesson 2.2 Ocean Floor
*Refer to Chapter 3 in your Textbook

2. Lesson 2.2 Learning Targets:
Identify & label the ocean zones.
Label & identify ocean floor features.
Describe the composition of the seafloor.

3. Ocean Zones: Hortizontal:
Intertidal Zone: area closest to shore, covered during high tide and exposed to air during low tide
Neritic Zone: extends from the intertidal zone to the continental shelf
Oceanic Zone: extends from the continental shelf to the end of the continental slope

4. Ocean Zones: Vertical: Pelagic Zone: “open ocean”
Photic: portion of the pelagic zone with sunlight
Aphotic: portion of the pelagic zone without sunlight
Benthic Zone: “bottom of ocean,” ocean floor
Hadal Zone: below the bottom of the ocean floor (trenches)

6. Ocean Floor:
Bathygraphic features: are the physical features of the ocean VS Topographic features of land
Ocean Floor Divided into 2 regions:
Continental Margin: from continental shelf to rise
Ocean Basin: from continental rise to open ocean

7. 1. Continental Margin: Continental Shelf: top of margin
Continental Slope: sharp drop from shelf
Continental Rise: bottom of slope, gradual drop
Submarine Canyon: deep cut in continental margin

8. 2. Ocean Basin: Abyssal Plains: flat ocean bottom
Seamounts: single underwater pointed mountain
Guyots: single underwater flat mountain
Trenches: deep cut in the ocean floor
Ridges: a continuous series of underwater mountains

9. 2. Ocean Basin:

10. Composition of the Ocean Floor:
Basalt rock covered by a layer of sediment
Types of Sediment:
Hydrogenous: forms from chemical processes in the seawater
Biogenous: forms from the shells & skeletons of living organisms
Terrigenous: carried into the ocean from the land
Cosmogenous: particles from outer space