Table of Contents
- 1 How is continental rise formed?
- 2 Where is the continental rise and how is it formed?
- 3 What does the continental rise look like?
- 4 What is an example of continental rise?
- 5 What’s the difference between continental slope and rise?
- 6 What is the average depth of continental slope?
- 7 Where can a continental rise be found?
- 8 Which is the largest continental shelf?
How is continental rise formed?
Continental rises form as a result of three sedimentary processes: mass wasting, the deposition from contour currents, and the vertical settling of clastic and biogenic particles.
Where is the continental rise and how is it formed?
Alluvial or sedimentary fans are shallow cone-shaped reliefs at the base of the continental slope that merge together, forming the continental rise. Erosional submarine canyons slope downward and lead to alluvial fan valleys with increasing depth.
Where does the continental shelf slope and rise?
The shelf usually ends at a point of increasing slope (called the shelf break). The sea floor below the break is the continental slope. Below the slope is the continental rise, which finally merges into the deep ocean floor, the abyssal plain. The continental shelf and the slope are part of the continental margin.
What does the continental rise look like?
Continental rises feature deep-sea fans. In appearance they are much like alluvial fans on land found along the fronts of mountain ranges. Deep-sea fans are accumulations of sediment deposited by turbidity currents (called turbidites) at the foot of the continental slope.
What is an example of continental rise?
The continental rise completely surrounds Antarctica covering 39.4% of the Southern Ocean (see Table), forming a halo of sediment surrounding the Antarctic continent.
Is the continental rise active or passive?
Active continental margins are those that are tectonically active, such as along much of the Pacific coast. Active margins are marked by earthquakes, volcanoes, and mountain belts. Unlike passive margins, they lack a continental rise and abyssal plain.
What’s the difference between continental slope and rise?
3 – The continental slope is made of continental crust, but the continental rise is made of sediment. When sea level drops, parts of the continental shelves are the first to be exposed. The continental shelves are the shallowest parts of the continental margins, so if sea level drops, they are the first to be exposed.
What is the average depth of continental slope?
The world’s combined continental slope has a total length of approximately 300,000 km (200,000 miles) and descends at an average angle in excess of 4° from the shelf break at the edge of the continental shelf to the beginning of the ocean basins at depths of 100 to 3,200 metres (330 to 10,500 feet).
What is the difference between continental slope and continental rise?
Where can a continental rise be found?
The continental rise completely surrounds Antarctica covering 39.4% of the Southern Ocean (see Table), forming a halo of sediment surrounding the Antarctic continent. Example of continental rise (in yellow) and submarine fan (red) adjacent to the coast of southeastern Brazil.
Which is the largest continental shelf?
Exceptionally broad shelves occur off northern Australia and Argentina. The world’s largest continental shelf extends 1,500 km (about 930 miles) from the coast of Siberia into the Arctic Ocean. Continental shelves are usually covered with a layer of sand, silts, and silty muds.
Why is there no continental rise on an active margin?
Active margins are marked by earthquakes, volcanoes, and mountain belts. Unlike passive margins, they lack a continental rise and abyssal plain. Instead, the continental slope ends in an oceanic trench, and beyond the trench, the topography is hilly and irregular, often dotted with rugged volcanic seamounts.