Oceanography

Tablular representation of relief of sea floor

Tabular representation of relief of sea floor

Feature	Width	Relief	Water Depth	Bottom Gradient
Continental Shelf	<300 km	< 20 m	<150 m	<1:1,000(~0.5°)*
Continental slope	<150km	Locally > 2km	Drops from 100 +-2000+m	~1:40(3-6°)
Continental rise	<300km	<40km	1.5-5km	1: 1,000-1:700(0.5°-1°)
Submarine canyon	1-15km	20-2,000m	20-2,000m	<1:40(3-6°)
Deep-sea trench	30-100km	>2km	5,000-12,000m	---
Abyssal hills	100-100,000m(100km)	1-1,000 m	Variable	---
Seamounts	2-100km	>1,000km	Variable	---
Abyssal plains	1-1,000km	0	>3km	1:1,000-1:10,000(<0.5°)
Midocean ridge	500-1,500km	<1km	>3km	----
Midocean ridge crest	500-1,000km	<2km	2-4km	----

●      A bottom gradient of 1:1,000 means that the slope rises 1m vertically across a horizontal distance of 1,000m.