Page 62 - Geography for Secondary Schools Student’s Book Form One

Geography for Secondary Schools
Student’s Book Form One

Table 4.1: Relative sizes of the world’s major oceans
SN Ocean Size (Million Km )
2
1 Pacific Ocean 168.7
2 Atlantic Ocean 85.1

3 Indian Ocean 70.5
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4 Southern Ocean 22.0

5 Arctic Ocean 15.6
Source: https://www.surfertoday.com/environment/what-are-the-five-oceans-of-the-world

Exercise 4.4

1. What is the difference between an ocean and a sea?

2. What determines the salinity of oceans and seas?

The ocean floor and its features

Ocean floor (sea-bed) refers to a landscape found at the bottom of the ocean. The ocean
floor is made up of various features. The major features of the ocean floor include the
continental shelf, the continental slope, oceanic ridges, deep sea plain, ocean deep
(trench), ocean plain, oceanic island, and submarine plateaus (Figure 4.11).

Ocean deep (trench) Continental rise
Continental slope
Sea level
Oceanic Abyssal
Mid island plain Continental
ocean shelf Land
ridge Abyssal
hill

Figure 4.11: Features of the ocean floor

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