Maharashtra Board Class 9 Geography Solution Chapter 6 – The Properties of Sea Water
Balbharati Maharashtra Board Class 9 Geography Solution Chapter 6: The Properties of Sea Water. Marathi or English Medium Students of Class 9 get here The Properties of Sea Water full Exercise Solution.
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Board |
MSBHSE Maharashtra Board |
| Subject |
Geography Solution (Bhugol) |
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Chapter |
The Properties of Sea Water |
Q1. Tick the correct box according to the salinity of the ocean water Salinity
High Medium Low
(a) Slanting sunrays, melting snow
(b) Cloudy sky, rainfall throughout the year
(c) Clear skies for the most part, perpendicular sunrays
(d) Less supply of freshwater, desert area around
(e) Low temperatures, ample supply of river water
(f) Continental location, desert around, low rainfall *
Q2. Give reasons.
(a) Salinity is low in the land-locked Baltic Sea.
Ans)Salinity is low in the land-locked Baltic Sea as the temperature is very low and most of the time the sea is covered with snow. Evaporation is also very less so the salinity is also very low.
(b) There is higher salinity in the northern Red Sea while lower in the southern.
Ans)There is higher salinity in the northern Red Sea than the southern because the northern Red Sea has Gulf of Suez water .The water from the Gulf of Suez has 40 parts per thousand salinity.It has also high evaporation rate and consequently a high density.
(c) Oceans located at the same latitude do not have same salinity.
Ans) Oceans located at the same latitude do not have same salinity because salinity does not depend on latitude rather it depends on salts deposited in the water and on the rate of evaporation.
(d) With increasing depth, the temperature of sea water decreases to a certain limit.
Ans) With increasing depth, the temperature of sea water decreases to a certain limit because the sun rays do not reach at the utmost bottom of the sea level. As a result the temperature of the bottom of the sea is lesser than the upper most layers.
(e) There are more salt-pans on the Western coast of India than its eastern coast.
Ans) Western coast of India is full of salt accumulated rocks and rock particles rather than the eastern coast. It is the main reason behind salt-pans on the Western coast of India.
(f) Salinity increases in the mid-latitudinal zones.
Ans) Salinity increases in the mid-latitudinal zones because of high evaporation and this zone has the hot deserts of the world.
Q3. Answer the following questions.
(a) What are the factors affecting the salinity of the sea water?
Ans)The factors affecting the salinity of the sea water are-
- Uneven distribution of temperature on earth due to sunrays.
- Uneven supply of freshwater, mainly because of rainfall.
(b) Explain the distribution of salinity around the Tropic of Cancer and tropic of Capricorn.
Ans)The salinity around the Tropic of Cancer and tropic of Capricorn is high as temperature is higher and the rate of evaporation is also higher.
(c) What are the factors affecting the temperature of the sea water?
Ans) The factors affecting the temperature of the sea water are-
1.Latitudinal extension-The temperature of the sea water depends upon latitudinal extension because the surface temperature of the seawater is not uniform everywhere and it decreases from the equatorial areas towards the poles.
- Ocean currents- The surface temperature of the seawater is lessen by the cold ocean current. But where the hot ocean currents flow the temperature of the seawater automatically increases.
- Cyclones, rainfall, sea waves, salinity, pollution, convectional currents, seasons, etc. also affect the surface temperature.
(d) Explain the changes occurring in the temperature of sea water according to the depth.
Ans) Some ofthe sunrayspenetrate to certain depths in the sea water and most of the sunrays radiate back from the surface of the sea. The intensity of sunrays decreases with increasing depth and the temperature decreases up to 2000m depth, after that it is uniform everywhere.
(e) Name the factors affecting salinity.
Ans)The factors affecting salinity are-
- Uneven distribution of temperature on earth due to sunrays.
- Uneven supply of freshwater, mainly because of rainfall.
Q4. Explain how temperature affects the following.
(a) the density of sea water
Ans) Temperature affects the density of sea water.Decreasing temperature increases the density of the sea water. As a result density of the sea water of polar region is more denser than the equatorial region.
(b) the salinity of sea water
Ans) The salinity of sea water depends upon the temperature. Increasing temperature can increase the rate of evaporation . Evaporated water turns into water vapour and reduces in quantity,but amount of salt remains the same in the remaining water andtherefore the salinity of the water increases.
