Question 2: Why It is economic to carry out transport by water ways.

Step-by-step solution provided.

Question 1: Collect information about how a natural pearl is formed.

Step-by-step solution provided.

Maharashtra State Board Class 6 Geography Solutions Chapter 6 Importance of Oceans - Digest Answers | Maharashtra Board Solutions

Maharashtra Board Class 6 Geography Solutions Chapter 6 Importance of Oceans

Class 6 Geography Chapter 6 Importance of Oceans Textbook Questions and Answers

A. Find the odd man out:

Question 1 Maharashtra Board Solution

Shell, fish, crab, ship

Solution & Step-by-Step Answer:

ship

Question 2 Maharashtra Board Solution

Arabian Sea, Mediterranean Sea, Dead Sea, Caspian Sea

Solution & Step-by-Step Answer:

Dead Sea

Question 3 Maharashtra Board Solution

Sri Lanka, India, Norway, Peru

Solution & Step-by-Step Answer:

Sri Lanka

Question 4 Maharashtra Board Solution

Southern Ocean, Indian Ocean, Pacific Ocean, Bay of Bengal

Solution & Step-by-Step Answer:

Bay of Bengal

Question 5 Maharashtra Board Solution

Natural gas, salt, gold, manganese

Solution & Step-by-Step Answer:

Natural gas

B. Write the answers:

Question 1 Maharashtra Board Solution

Which items does man get from the oceans?

Solution & Step-by-Step Answer:

Salt, fish, shells and other products, minerals like iron, lead, cobalt, sodium, manganese, chromium, zinc, mineral oil and natural gas are the items man gets from oceans.

Question 2 Maharashtra Board Solution

Why It is economic to carry out transport by water ways.

Solution & Step-by-Step Answer:

Question 3 Maharashtra Board Solution

Why There is a difference in the climate of regions close to the oceans and regions far away from the oceans.

Solution & Step-by-Step Answer:

(i) The oceans influence the climatic condition of a place. Coastal areas are cooler and wetter than regions away from the ocean.

(ii) There is a difference in the maximum and minimum temperature with the difference being less in coastal region (nearness to the sea) while it is more in the region far away from the sea (continentality).

(iii) The temperature in coastal areas remains equable due to the mixing of vapour released through evaporation of water from these water bodies into air. This vapour absorbs and stores the heat released from the land.

Question 4 Maharashtra Board Solution

Which continents are located along the coast of the Pacific Ocean?

Solution & Step-by-Step Answer:

Asia, Australia, North America and South America are the continents located along the coast of the Pacific Ocean.

Activity:

Colour the different oceans on an outline map of the world and prepare an index for the map. (See inside front cover, figure B.)

Project:

Group work: Make five groups. Each group should collect some information and pictures of one ocean. With the help of the information collected, each group should make a poster and make presentation.

Class 6 Geography Chapter 6 Importance of Oceans InText Questions and Answers

Think a little!

Question 1 Maharashtra Board Solution

Where does the water flowing through the rivers go in the end?

Solution & Step-by-Step Answer:

The water flowing through the rivers goes into the oceans in the end.

Question 2 Maharashtra Board Solution

Are there volcanic eruptions in the seas?

Solution & Step-by-Step Answer:

Yes, volcanic eruptions take place in the seas.

Question 3 Maharashtra Board Solution

What would have happened if man had not discovered sea routes?

Solution & Step-by-Step Answer:

Use your brain power!

Question 1 Maharashtra Board Solution

Where did all this water on the earth come from?

Solution & Step-by-Step Answer:

While some scientists believe that water was created due to the impact of comets there are others who believe that Earth’s waters have existed since the birth of planet earth.

Find out:

Question 1 Maharashtra Board Solution

Collect information about how a natural pearl is formed.

Solution & Step-by-Step Answer:

Question 2 Maharashtra Board Solution

Which oceanic organism develops in it?

Solution & Step-by-Step Answer:

The oceanic organism oyster develops in it.

Question 3 Maharashtra Board Solution

In which sea is it found in India?

Solution & Step-by-Step Answer:

The Arabian Sea.

What will you do?

Question 1 Maharashtra Board Solution

Different marine animals like the blue whale, turtle, starfish, etc. appear before you in your dream and complain to you. They say, “You humans are not allowing us to live properly. You throw the waste and chemicals that you do not want into our house. The youngsters in our house are falling ill due to this. Some are getting killed. You must think about this situation and remove the pollution from the seas.” Now tell what you will do.

Solution & Step-by-Step Answer:

“Environmental problems begin with people as the cause and end with people as the victims.” Different ways to remove pollution from sea are:

Can you do it?

Question 1 Maharashtra Board Solution

Sameer and Sania are playing a game of showing the waterways on a map of the world. Their routes are going in opposite directions. One of the following the eastern route while the other is making a route that takes to the west.

From Mumbai port some goods are to be taken to London in UK. On a map of the world, show at least two such routes with a pencil.
Write down the names of the ports of different nations that fall on the route followed by each.

Ports on the route followed by Sameer:

Solution & Step-by-Step Answer:

Ports on the route followed by Sania:

Question 2 Maharashtra Board Solution

Which of the routes you feel is shorter? That of Sameer’s or Sania’s?

Solution & Step-by-Step Answer:

Sameer’s route is shorter.

Question 3 Maharashtra Board Solution

Which oceans does one have to pass through if one follows Sameer’s route or Sania’s route?

Solution & Step-by-Step Answer:

If one follows Sameer’s route one has to pass through the Indian Ocean and North Atlantic Ocean. If Sania’s route is taken she has to pass through the Pacific and North Atlantic Ocean.

Question 4 Maharashtra Board Solution

What are Panama and Suez? For what purpose were they constructed?

Solution & Step-by-Step Answer:

Question 5 Maharashtra Board Solution

Have they been used in Sameer’s and Sania’s routes?

Solution & Step-by-Step Answer:

Yes, Suez Canal is used in Sameer’s route while Panama Canal is used in Sania’s route.

Class 6 Geography Chapter 6 Importance of Oceans Additional Important Questions and Answers

Fill the blanks choosing the correct alternatives from the brackets:

Question 1 Maharashtra Board Solution

The ______ includes all the water bodies like oceans, seas, rivers and their tributaries, lakes, reservoirs and also ground water that exist on the earth. (lithosphere, atmosphere, hydrosphere)

Solution & Step-by-Step Answer:

hydrosphere

Question 2 Maharashtra Board Solution

Total global water 97.7% is contained in ______ (lakes, oceans, seas)

Solution & Step-by-Step Answer:

oceans

Question 3 Maharashtra Board Solution

The ocean with an area 166,240,977 sq. km is the _______ ocean. (Indian, Atlantic, Pacific)

Solution & Step-by-Step Answer:

Pacific

Question 4 Maharashtra Board Solution

All rivers flowing from mountains or hilly areas finally meet in the ________.(lakes, seas, oceans)

Solution & Step-by-Step Answer:

oceans

Question 5 Maharashtra Board Solution

Salinity is expressed in terms of ______.(mils, ml, gms)

Solution & Step-by-Step Answer:

mils

Question 6 Maharashtra Board Solution

The average salinity of oceanic water is _______.(80%, 332%, 35%)

Solution & Step-by-Step Answer:

35%

Question 7 Maharashtra Board Solution

The salinity of the Dead Sea is _____.(332 %, 35%, 60%)

Solution & Step-by-Step Answer:

332 %

Question 8 Maharashtra Board Solution

About ________ of the surface of the earth is occupied by water. (90%, 95%, 70.8%)

Solution & Step-by-Step Answer:

70.8%

Question 9 Maharashtra Board Solution

Salt as a substance is obtained by constructing ______. (sea bed, salt pan, river bunds)

Solution & Step-by-Step Answer:

salt pan

Question 10 Maharashtra Board Solution

________ is conducted on a much higher scale as compared to the other modes of transport. (Water transport, Air transport, Road transport)

Solution & Step-by-Step Answer:

Water transport

Question 11 Maharashtra Board Solution

Pollution of _________ water is caused due to oil spills. (river, lake, oceanic)

Solution & Step-by-Step Answer:

oceanic

Question 12 Maharashtra Board Solution

Winds blowing due to pressure difference in the belts is called ______. (planetary winds, oceanic winds, minerals)

Solution & Step-by-Step Answer:

planetary winds

Match the pairs correctly:

Question 1 Maharashtra Board Solution

Oceans	The area in sq. km
(1) Pacific	(a) 20,327,000
(2) Atlantic	(b) 73,426,163
(3) Indian	(c) 166,240,977
(4) Southern	(d) 13,224,479
(5) the Arctic	(e) 86,557,402

Solution & Step-by-Step Answer:

1 – c
2 – e
3 – b
4 – a
5 – d

Find the odd man out:

Question 1 Maharashtra Board Solution

Pearls, corals, diamonds, medicinal plants

Solution & Step-by-Step Answer:

diamonds

Question 2 Maharashtra Board Solution

Spain, Norway, Japan, India

Solution & Step-by-Step Answer:

India

Question 3 Maharashtra Board Solution

Blue whale, sea turtles, seerfish, dolphins

Solution & Step-by-Step Answer:

seerfish

Name the following:

Question 1 Maharashtra Board Solution

Water bodies which are a part of the. hydrosphere.

Solution & Step-by-Step Answer:

Oceans, seas, rivers and their tributaries, lakes, reservoirs, ground water. Question 2. Percentage of global waters contained in oceans. Answer: 97.7%

Question 3 Maharashtra Board Solution

Two aquatic animals found in the ocean.

Solution & Step-by-Step Answer:

Question 5 Maharashtra Board Solution

Places where volcanic eruptions occur.

Solution & Step-by-Step Answer:

Question 6 Maharashtra Board Solution

Two minerals obtained from the sea.

Solution & Step-by-Step Answer:

Question 7 Maharashtra Board Solution

Two uses of marine animals.

Solution & Step-by-Step Answer:

Question 8 Maharashtra Board Solution

Two countries with coastline which largely depends on the sea for their livelihood.

Solution & Step-by-Step Answer:

Question 9 Maharashtra Board Solution

The controller of global temperature and source of rains.

Solution & Step-by-Step Answer:

Oceans.

Question 10 Maharashtra Board Solution

The beginning and end of the water cycle takes place here.

Solution & Step-by-Step Answer:

Oceans.

Question 11 Maharashtra Board Solution

Two minerals obtained from the ocean floor.

Solution & Step-by-Step Answer:

Question 12 Maharashtra Board Solution

Precious items obtained from the seas.

Solution & Step-by-Step Answer:

Question 13 Maharashtra Board Solution

Mode of transport used for large scale transportation of goods.

Solution & Step-by-Step Answer:

Question 14 Maharashtra Board Solution

Two actions by man which has lead to large scale pollution in oceanic waters.

Solution & Step-by-Step Answer:

Answer the following in one sentence each:

Question 1 Maharashtra Board Solution

What happens when aquatic animals die?

Solution & Step-by-Step Answer:

When aquatic animals die, their remains accumulate in the oceans.

Question 2 Maharashtra Board Solution

What enters the ocean with the rain water?

Solution & Step-by-Step Answer:

Sediments from eroded lands, trees and bushes flowing with water, dead remains, etc. enter the ocean with the river water.

Question 3 Maharashtra Board Solution

What happens when the dead remains in the ocean decompose?

Solution & Step-by-Step Answer:

When the dead remains in the oceans decompose it releases various minerals and salts in the ocean water.

Question 4 Maharashtra Board Solution

Where do we find maximum salinity?

Solution & Step-by-Step Answer:

The Dead Sea is known to have the maximum salinity of 332%.

Question 5 Maharashtra Board Solution

How is salt obtained?

Solution & Step-by-Step Answer:

Salt as a substance is obtained by constructing salt pans in the coastal areas.

Question 6 Maharashtra Board Solution

Which is one of the ancient occupations of human beings and what is the major purpose of his activity?

Solution & Step-by-Step Answer:

Fishing is one of the ancient occupation and the major purpose of this activity is to obtain food.

Question 7 Maharashtra Board Solution

How does the earth get rainfall?

Solution & Step-by-Step Answer:

The oceans have a vast expanse, therefore huge amounts of vapour get created and this process goes on continuously and from this vapour the earth gets rainfall.

Question 8 Maharashtra Board Solution

How is pollution caused in oceanic water?

Solution & Step-by-Step Answer:

In order to fulfill his requirements, man undertakes many activities that lead to the production of huge amounts of different types of waste materials which cause pollution.

Question 9 Maharashtra Board Solution

Write anyone cause of pollution of oceanic waters.

Solution & Step-by-Step Answer:

Cutting of mangroves forests in coastal areas is one of the main cause of pollution in oceanic waters.

Question 10 Maharashtra Board Solution

How does oceanic pollution affect the aquatic animals?

Solution & Step-by-Step Answer:

Due to oceanic pollution many aquatic animals are under the threat of being extinct. For example, the blue whale, some types of sea turtles, dolphins, etc.

Question 11 Maharashtra Board Solution

Which items does man get from the oceans?

Solution & Step-by-Step Answer:

Salt, fish, shells and other products, minerals like iron, lead, cobalt, sodium, manganese, chromium, zinc, mineral oil and natural gas are the items man gets from oceans.

Question 12 Maharashtra Board Solution

Which continents are located along the coast of the Pacific Ocean?

Solution & Step-by-Step Answer:

Asia, Australia, North America and South America are the continents located along the coast of the Pacific Ocean.

Give geographical reasons for the following statements:

Question 1 Maharashtra Board Solution

The ocean water is saltier than drinking water.

Solution & Step-by-Step Answer:

(i) In drinking water, the proportion of salts is quite low. Water from oceans and seas has a greater amount of salt. Hence it tastes salty.

(ii) Volcanic eruptions leads to increase in the level of salts and minerals in ocean water.

(iii) Volcanic eruptions takes place in the oceans. During volcanic eruptions different minerals, ashes, salts and gases are added to the water. This increases the level of salts and minerals in ocean water.

(iv) Due to continuous evaporation of oceanic water, the proportion of salt increase.

Question 2 Maharashtra Board Solution

The temperature in coastal areas remains equable.

Solution & Step-by-Step Answer:

(i) In regions close to the oceans, seas or large reservoirs, there is not much of a difference in the temperature throughout the day.

(ii) The main reason for this is the mixing of vapour released through evaporation of water from these water bodies into air.

(iii) This vapour in the air absorbs and stores the heat released from the land.

(iv) Hence, the temperature in coastal regions remain equable.

Question 3 Maharashtra Board Solution

It is economic to carry out transport by water ways.

Solution & Step-by-Step Answer:

Question 4 Maharashtra Board Solution

There is a difference in the climate of regions close to the oceans and regions far away from the oceans.

Solution & Step-by-Step Answer:

(i) The oceans influence the climatic condition of a place. Coastal areas are cooler and wetter than regions away from the ocean.

Question 5 Maharashtra Board Solution

Oceans act as the controller of global temperature.

Solution & Step-by-Step Answer:

(i) Winds move the oceanic water in the form of currents.

(ii) Ocean currents move from the equatorial region to polar regions and from polar regions to the equatorial region.

(iii) This leads to the redistribution of heat on the earth.

(iv) The cold currents moving towards the equatorial region making the temperature of coastal areas in that zone milder whereas the warm currents coming in the colder region cause the temperature in coastal areas to rise. Hence, the oceans act as the controller of global temperature.

Answer the following questions in brief:

Question 1 Maharashtra Board Solution

What are planetary winds?

Solution & Step-by-Step Answer:

Question 2 Maharashtra Board Solution

Write in brief about oceanic transport.

Solution & Step-by-Step Answer:

Question 3 Maharashtra Board Solution

How do ocean currents aid water transport?

Solution & Step-by-Step Answer:

Question 4 Maharashtra Board Solution

List the causes that lead to large scale pollution of oceanic water.

Solution & Step-by-Step Answer:

The causes that lead to large scale pollution of oceanic water are:

Do it yourself!

Question 1 Maharashtra Board Solution

Calculate the difference between the mean maximum and minimum temperature and write in the last column

Place	Country	Mean Max. Temp. °C	Mean Min. Temp. °C	Range of Temperature
Beijing	China	18.4	08.4	10
Istanbul	Turkey	18.0	10.0	08	_______
Madrid	Spain	19.0	09.0	10
New York66	United States	16.3	08.3	08	________
Denver	United States	16.2	02.2	14
Kabul	Afghanistan	14.7	05.2	09.5	________
Baghdad	Iraq	30.4	14.7	15.7

Question 2 Maharashtra Board Solution

Highlight the rows for the places having a range of temperatures over 10°C with red colour, other rows in blue colour (Refer the above table) Question 3. Find the locations of these places from an atlas. (Students activity) Question 4. Which places are closer to the oceans? Tell whether the range of temperature at these places is l ess or more?

Solution & Step-by-Step Answer:

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Solution & Step-by-Step Answer:

Istanbul and New York are closer to the oceans. These places which are closer to the oceans have lesser range of temperature.

Question 5 Maharashtra Board Solution

What might be the main reason leading to differences in the temperature range in different places?

Solution & Step-by-Step Answer:

The main reason leading to differences in temperature range in different places is because of the location of the place on the planet earth. Other factors like latitude, altitude, atmosphere, ocean currents, planetary winds etc. too have their impact.

Question 6 Maharashtra Board Solution

In which thermal zone are all these places located?

Solution & Step-by-Step Answer:

All these places are located in the temperate thermal zone.

Question 7 Maharashtra Board Solution

Which places are fai away from the oceans? Do these places have a greater or smaller temperature range?

Solution & Step-by-Step Answer:

Istanbul, Denver, Kabul and Baghdad are far away from the ocean as these places have a greater temperature range.

Question 8 Maharashtra Board Solution

Mention the places having the smallest and greatest temperature ranges.

Solution & Step-by-Step Answer:

Istanbul and New York have the smallest temperature range while Baghdad has the greatest temperature range.