Answer:
Features include abyssal hills, aseismic ridges and seamounts.
Explanation:
Ocean basin is a vast submarine region that collects to about "three-fourths" of the earth’s surface. The majority of water on our planet has an average depth of 4 kilometres or 2.5 miles.
The different features of ocean basin include deep-sea trenches, ocean ridges, linear fracture zones, aseismic ridges, abyssal hills, seamounts. Let us discuss few features as follows:
Aseismic ridges:
- These are the mountainous structures that are long and linear.
- They usually do not cause earth quakes but they are constructed by volcanoes.
- A best displayed aseismic ridge which is the largest volcanic edifice is the "Hawaiian-emperor chain".
Abyssal hills:
- A well-defined submarine that is topologically perfect which is of several hundred meters are abyssal hills.
- Their diameters are very large.
- The abyssal sea floor is occupied exclusively by the abyssal hills.
- These are covered with marine sediments and formed by volcanism and block faulting.
Seamounts:
- These are the large volcanic submarine mountains that are 3,300 feet above the sea-bed.
- Of the different types of mountains, the small volcanic seamounts are called sea knolls and the flat ones are called guyots.
- The flanks of seamounts are covered with thin layers of marine sediments.