Hydrosphere Oceans and Their Circulation - Class 7 Social Science - Chapter 13 - Notes, NCERT Solutions & Extra Questions
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Back Questions - Hydrosphere Oceans and Their Circulation | Social Science Success | Social Science | Class 7
Sometimes internal movements of the earth cause undersea
(a) Earthquakes
(b) Volcanic eruptions
(c) Landslides
(d) All of these
The internal movements of the Earth can cause undersea:
- Earthquakes
- Volcanic eruptions
- Landslides
Therefore, the correct option is (d) All of these.
The temperature of the oceans is highest near the
(a) Equator
(b) Poles
(c) Tropics
(d) Arctic Circle
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The domain of water is termed as
(a) Lithosphere
(b) Biosphere
(c) Hydrosphere
(d) Atmosphere
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At the higher levels, water vapour
(a) Evaporates
(b) Precipitates
(c) Condenses
(d) Freezes
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he meeting of warm and cold ocean currents results in
(a) Rainfall
(b) Sleet
(c) Snowfall
(d) Thick Fog
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The process through which water continuously changes its form?
(a) Water Cycle
(b) Food cycle
(c) Rain
(d) All of these
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The ________________ is the world's saltiest sea, with one part salt to every five parts water.
(a) Dead Sea
(b) Red sea
(c) Caribbean sea
(d) None of these
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The movements that occur in oceans can be broadly called
(a) Wave
(b) Circulation
(c) Water cycle
(d) All of these
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Which is the Japanese word which means 'Harbour waves'?
(a) Tsunami
(b) Sea waves
(c) Ocean waves
(d) None of these
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The rhythmic rise and fall of ocean water twice in a day is known as:
(a) Tide
(b) Wave
(c) Ocean current
(d) None of these
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Which day of the year is celebrated as Water Day?
(a) 26 January
(b) 15 January
(c) 15 August
(d) 22 March
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Match the following
Column A | Column B |
---|---|
1. World's saltiest sea | (a) Low tide |
2. Tides after the full moon | (b) Caspian Sea |
3. Water recedes from the shore | (c) Dead Sea |
4. World's largest salt water lake | (d) Ocean currents |
5. Rivers of the ocean | (e) Spring tides |
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What causes huge waves in the sea?
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What makes the sea water salty?
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What is the other name for "Seismic sea waves"?
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Which type of tide raises the water level close to shores?
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What deflects the direction of the winds?
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What are ocean currents? Name two types of ocean currents.
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Name the factors that cause movement of the ocean water.
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Why the ocean water is salty? What is the average salinity of ocean water?
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State any two importance of tides.
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What are destructive waves?
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What is 'hydrological cycle'? Explain with the help of a diagram.
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Differentiate between currents and waves.
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"There is greater variation of salinity in the partly or wholly enclosed seas". Give reasons.
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Masses of ocean water moving in definite directions are called ocean currents. How do ocean currents modify the climate of coastal regions? Give one example.
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How do the rotation of the earth and gravitational pull cause movement of ocean water? Explain.
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In the questions given below, there are two statements marked as Assertion (A) and Reason (R). Read the statements and choose the correct option.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true.
1. Assertion (A): Tides indicate the regular and periodic rise and fall in sea level.
Reason (R): Tides are caused by the gravitational pull of the Moon and sea level.
2. Assertion (A): There is high salinity in Red Sea.
Reason (R): Rate of evaporation is high in Red sea.
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Fill in the Water Cycle diagram as a class, then answer the questions below.
(i) The process when liquid water becomes gas in the atmosphere is called ______________________
(ii) The movement of water underground is called ______________________
(iii) ______________________ is the water that falls from clouds as rain or snow.
(iv) Water on the earth's surface which moves into a stream or lake without absorbing into the soil is called ______________________
(v) ______________________ is the downward movement of water through the specs of rocks or soil; when surface water becomes groundwater.
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Write a brief note on the given image:
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Notes - Hydrosphere Oceans and Their Circulation | Class 7 Social Science Success | Social Science
Hydrosphere: Oceans and Their Circulation - Comprehensive Class 7 Notes
The hydrosphere covers about 71% of the Earth's surface, with oceans playing a crucial role. Understanding their circulation helps us grasp their impact on climate, marine life, and human activities.
Ocean Salinity
Causes of Ocean Salinity
Ocean water contains dissolved minerals like sodium chloride, contributing to its saltiness. Rivers dissolve and carry these minerals into the oceans.
Factors Affecting Salinity
Rainfall and Ice Melting: Dilute salinity levels.
Evaporation: Increases salinity as water evaporates and leaves salts behind.
Temperature of the...
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