1. Topography of the ocean floor
Ocean Bathymetry
Topography of the ocean floor

2. Main Regions Continental Margins – drowned edges of the continents
Deep-ocean Basins – the ocean floor that lies deeper than 2000 m
Mid-ocean Ridges – a continuous underwater mountain range that winds its way through all the oceans

3. Continental Margins From the land:
Continental shelf – almost flat, gradual slope seaward at the edges of the continents; covered with sediments from the land
Continental slope – steeper slope seaward; contains submarine canyons
Continental rise – shallower slope composed of sediments that have fallen from slope.

4. Continental Margin

5. Deep-Ocean Basins Lie beyond the continental margins and contain:
Abyssal plains – very flat areas at depths of 3-5 km
Seamounts – underwater volcanoes, some > 1000 m high
Deep-sea trenches – steep-sided, long, narrow depressions. Deepest regions on earth; found near continental margins

6. Deep-Ocean Basins

7. Mid-Ocean Ridges
Underwater mountain ranges that are the longest on earth
Occupy 1/3 of the ocean floor
Not all are “mid-ocean”
Contain rift valleys at the summits as well as many fracture zones, where rocks have cracked and slid past one another

8. Mid-Ocean Ridges

9. Mid-Ocean Ridge Locations

12. Which coast has the wider shelf?