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Question
Give reason.
Salinity increases in the mid-latitudinal zones.
Answer in Brief
Solution
- In mid-latitudinal zones (25° to 35° N and S), rainfall is less.
- The supply of fresh water from rivers is also low.
- This zone has the world's hot deserts, so the salinity of the seas is higher here.
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Properties of Sea Water - Salinity of the Sea Water
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Give reason.
Salinity is low in the land-locked Baltic Sea.
Give reason.
Oceans located at the same latitude do not have same salinity.
What are the factors affecting the salinity of the sea water?
Explain how temperature affects the following.
The salinity of sea water
Complete the table showing the salinity of open and land-locked seas.
| Evaporation of water | Supply of freshwater | |||||
| Region | Latitude | Solar energy | Rainfall | River water | Snow water | Average salinity |
| Equatorial | 0° to 15° | High | Perennial | High | ________ | 34‰ |
| Tropical | 15° to 35° | __________ | Seasonal | ________ | ________ | 37‰ |
| Temperature | 35° to 65° | Low | ___________ | ________ | ________ | 33‰ |
| Polar | 65° to 90° | __________ | ___________ | Low | ample | 31‰ |
| Landlocked sea | Solar energy | Rainfall | River water | Snow water | Average salinity | |
| Mediterranean Sea | High | Low | Low | _______ | 39‰ | |
| Red Sea | _______ | _______ | _______ | _______ | 41‰ | |
| Baltic Sea | Low | _______ | Medium | _______ | 7‰ | |
| Dead Sea | _______ | Very low | Very less | _______ | 332‰ | |
| Caspian Sea | _______ | ______ | ______ | ______ | 155‰ | |
| Great Salt lake | medium | ______ | ______ | ______ | 220‰ | |
