MOVEMENTS OF OCEAN WATER | Class 11 Geography Notes
By ConceptScroll Team · Published on 17 July 2026 · 4 min read
MOVEMENTS OF OCEAN WATER – this guide gives you a concise, exam-ready overview of MOVEMENTS OF OCEAN WATER from Class 11 Geography, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
WAVES
Waves are the movement of energy across the ocean surface, not the movement of water itself. Water particles move in circular orbits as a wave passes, returning approximately to their original position. The energy for waves primarily comes from wind blowing over the ocean surface. As wind speed increases, small ripples form and grow into larger waves, which can travel thousands of kilometers before reaching shorelines. When waves approach the shore, friction with the sea floor slows them down, causing the wave height to increase until the wave breaks. The largest waves are found in open oceans where winds have long distances to transfer energy. Wave characteristics such as height, length, and period depend on wind strength, duration, and the distance over which it blows (fetch). The motion of waves is a balance between the wind pushing water forward and gravity pulling wave crests downward, creating a continuous wave movement with water particles moving in circular paths beneath the surface.
📊 Diagram: Figure 13.1 illustrates the motion of waves and water molecules, showing circular water particle movement beneath the wave crest and trough, with arrows indicating the up and forward movement as the wave approaches, and down and backward movement as it passes.
🔗 Connection: Prepares for the study of tides, the vertical movement of ocean water influenced by gravitational forces.
Frequently asked questions
1. Multiple choice questions. (i) Upward and downward movement of ocean water is known as the : (a) tide (c) wave (b) current (d) none of the above (ii) Spring tides are caused : (a) As result of the moon and the sun pulling the earth gravitationally in the same direction. (b) As result of the moon and the sun pulling the earth gravitationally in the opposite direction. (c) Indention in the coast line. (d) None of the above. (iii) The distance between the earth and the moon is minimum when the moon is in : (a) Aphelion (c) Perihelion (b) Perigee (d) Apogee (iv) The earth reaches its perihelion in: (a) October (c) July (b) September (d) January
1.(i) Correct answer: (a) tide Explanation: Upward and downward movement of ocean water is called tide, caused mainly by gravitational pull of moon and sun.
1.(ii) Correct answer: (a) As result of the moon and the sun pulling the earth gravitationally in the same direction. Explanation: Spring tides occur when sun and moon are aligned, their gravitational forces combine causing higher high tides.
1.(iii) Correct answer: (b) Perigee Explanation: Perigee is the point in moon's orbit closest to e
2. Answer the following questions in about 30 words. (i) What are waves? (ii) Where do waves in the ocean get their energy from? (iii) What are tides? (iv) How are tides caused? (v) How are tides related to navigation?
(i) Waves are rhythmic movements of water on the ocean surface caused mainly by wind.
(ii) Waves get their energy from the wind blowing over the surface of the ocean.
(iii) Tides are the regular rise and fall of sea level caused by gravitational forces.
(iv) Tides are caused by the gravitational pull of the moon and the sun on the earth's oceans.
(v) Tides affect navigation by influencing water depth and currents, important for ship movement and docking.
3. Answer the following questions in about 150 words. (i) How do currents affect the temperature? How does it affect the temperature of coastal areas in the N. W. Europe? (ii) What are the causes of currents?
(i) Ocean currents influence the temperature of coastal regions by transporting warm or cold water from one place to another. For example, the Gulf Stream is a warm current that flows from the Gulf of Mexico towards the North Atlantic, warming the coastal areas of Northwestern Europe. This results in milder winters and a more temperate climate compared to other regions at similar latitudes.
(ii) The causes of ocean currents include wind patterns, the rotation of the Earth (Coriolis effect), dif
# Project Work (i) Visit a lake or a pond and observe the movement of waves. Throw a stone and notice how waves are generated. (ii) Take a globe and a map showing the currents of the oceans. Discuss why certain currents are warm or cold and why they deflect in certain places and examine the reasons.
Project Work does not have fixed answers but involves practical observation and discussion.
(i) Observing waves generated by throwing a stone helps understand wave formation and propagation.
(ii) Using a globe and ocean current maps helps analyze factors like Earth's rotation, wind patterns, and temperature differences that cause currents to be warm or cold and their deflection.
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