Class 11 Geography Chapter 14 Movements of Ocean Water The answer to each chapter is provided in the list so that you can easily browse throughout different chapters SCERT Class 11 Geography Chapter 14 Movements of Ocean Water and select need one.
Class 11 Geography Chapter 14 Movements of Ocean Water
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Movements of Ocean Water
Chapter: 14
PART-1
GEOGRAPHY
TEXTUAL QUESTION & ANSWER
Q.1. Upward and downward movement of ocean water is known as the-
(i) Tide
(ii) Current
(iii) Wave
(iv) None of the above
Ans: (i) Tide
Q.2. Spring tides are caused-
(i) As a result of the moon and the sun pulling the earth gravitationally in the same direction.
(ii) As a result of the moon and the sun pulling the earth gravitationally in the opposite direction.
(iii) Indention in the coast line.
(iv) None of the above.
Ans: (ii) As a result of the moon and the sun pulling the earth gravitationally in the opposite direction.
Q.3. The distance between the earth and the moon is minimum when the moon is in-
(i) Aphelion
(ii) Perigee
(iii) Perihelion
(iv) Apogee
Ans: (iii) Perihelion
Q.4. The earth reaches its perihelion in-
(i) October
(ii) September
(iii) July
(iv) January
Ans: (iv) January
Answer the following questions in about 30 words.
Q.1. What are waves?
Ans: The horizontal motions of oceans water are termed as waves. In this motions of water, the particles of water move in a vertical plane up and down.
Q.2. Where do waves in the ocean get their energy from?
Ans: Actually, the waves get their energy from the wind i.e. prevailing wind.
Q.3. What are tides?
Ans: The periodical rise and fall of the sea level, one or twice a day, Which are caused due to the attraction of the sun and the moon, is called a tide.
Q.4. How are tides caused?
Ans: Due to the gravitational attraction of the sun and the moon on the ocean water, the tides are developed.
Q.5. How are tides related to navigation?
Ans: Tides helps the navigations in different ways. Tidal heights are very important, especially harbors near rivers and within estuaries having shallow”bars” at the entrance, which prevent ships and boats from entering into the harbor.
Answer the following questions in about 150 words.
Q.1. How do currents affect the temperature? How does it affect the temperature of coastal areas in the N.W. Europe?
Ans: Ocean currents affect the temperature directly of their neighboring areas. The warm currents raise and the cold currents lower the temperature. The winds blowing over the cold current carry low temperature and have cooling effects, on the other hand wind blowing over warm currents have a warning effect and raise the low temperature.
West coasts of the continents in tropical and subtropical latitudes are bordered by cool waters. In case of the areas of the N.W. Europe in the presence of Warm Gulf Stream, the areas of the cause distinct marine climate. Moreover, the areas are characterized by cool summers and relatively mild winters with a marrow annual range of temperatures. The North Atlantic Drift warms up the areas of high latitude during the winter season i.e. the temperature remains moderate in the coastal areas of the N.W. Europe.
| Sl. No. | CONTENTS |
| Chapter 1 | Geography As A Discipline |
| Chapter 2 | The Origin and Evolution of the Earth |
| Chapter 3 | Interior of the Earth |
| Chapter 4 | Distribution of Oceans And Continents |
| Chapter 5 | Minerals and Rocks |
| Chapter 6 | Geomorphic Processes |
| Chapter 7 | Landforms and Their Evolution |
| Chapter 8 | Composition and Structure of Atmosphere |
| Chapter 9 | Solar Radiation, Heat balance, and Temperature |
| Chapter 10 | Atmospheric Circulation and Weather Systems |
| Chapter 11 | Water in the Atmosphere |
| Chapter 12 | World Climate and Climate Change |
| Chapter 13 | Water (Oceans) |
| Chapter 14 | Movements of Ocean Water |
| Chapter 15 | Life on the Earth |
| Chapter 16 | Biodiversity And Conservation |
| Chapter 17 | Indian Location |
| Chapter 18 | Structure and Physiography |
| Chapter 19 | Drainage System |
| Chapter 20 | Climate |
| Chapter 21 | Natural Vegetation |
| Chapter 22 | Soils |
| Chapter 23 | Natural Hazards and Disasters |
Q.2. What are the causes of currents?
Ans: These are various causes responsible for the ocean currents. But the following causes are regarded as major causes of currents:
(a) Heating by solar energy: It expands the ocean water. Due to more solar radiation near the equator the ocean water is about 8 cm higher in level than the middle latitudes. This causes a slight gradient and water tends to flow down the slope.
(b) Winds: Winds are also another major cause of current. Wind blowing on the surface of the ocean pushes the water to move. Friction between the wind and the water body in its course made ocean currents.
(c) Gravity: Gravity tends to pull the water down the pile and create gradient variation.
(d) Coriolis force: The Coriolis force intervenes and causes the water to move to the right in the northern hemisphere and to the left in the southern hemisphere.
(e) Variation in salinity: Salinity of ocean water varies from place to place. Water of high salinity is denser and heavier and the waters of low salinity are lighter. So, Waters tends to move from low salinity areas to high salinity areas.
(f) Configuration of coasts: Sometimes configuration of coasts also diverts the ocean currents.
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