With reference to the movements of ocean waters, which of the following are identified as the three chief movements? 1. Waves 2. Tides 3. Ocean currents 4. Tsunamis Select the correct answer using the code given below:

The correct option is (a). Explanation Ocean water is dynamic and constantly in motion. These movements are broadly classified into three categories based on the forces involved (such as wind, gravity, and density differences) and the nature of the movement (horizontal or vertical). Analysis of the Movements: - 1. Waves (Correct): Waves are oscillatory movements where water particles move in a circular motion, primarily driven by friction from winds. They represent the horizontal transmission of energy across the ocean surface. - 2. Tides (Correct): Tides are the periodic rise and fall of the sea level, occurring once or twice a day. They are vertical movements generated primarily by the gravitational attraction of the sun and the moon. - 3. Ocean Currents (Correct): Ocean currents represent the continuous flow of large volumes of water in a definite direction, similar to rivers flowing within the ocean. They are the primary form of horizontal water movement affecting global climate and navigation. - 4. Tsunamis (Incorrect): While tsunamis involve massive water movement, they are technically classified as seismic sea waves caused by the displacement of the ocean floor (due to earthquakes or volcanic activity). In standard geographical classification, the "three chief movements" are strictly identified as waves, tides, and currents. Key Takeaway: The three fundamental movements of ocean waters are Waves, Tides, and Ocean Currents. Tsunamis are a specific type of high-energy wave caused by endogenic forces, not a primary category of general ocean circulation.

NCERT Class 6 Geography — Chapter 2: Major Domains of the Earth

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With reference to the movements of ocean waters, which of the following are identified as the three chief movements?

Waves
Tides
Ocean currents
Tsunamis

Select the correct answer using the code given below:

Official previous-year question

Verified 1 Aug 2026.

Options

A1, 2 and 3 only
B2, 3 and 4 only
C1 and 4 only
D1, 2, 3 and 4

Did you get this right?

Solution

The correct option is (a).

Explanation

Ocean water is dynamic and constantly in motion. These movements are broadly classified into three categories based on the forces involved (such as wind, gravity, and density differences) and the nature of the movement (horizontal or vertical).

Analysis of the Movements:

1. Waves (Correct): Waves are oscillatory movements where water particles move in a circular motion, primarily driven by friction from winds. They represent the horizontal transmission of energy across the ocean surface.
2. Tides (Correct): Tides are the periodic rise and fall of the sea level, occurring once or twice a day. They are vertical movements generated primarily by the gravitational attraction of the sun and the moon.
3. Ocean Currents (Correct): Ocean currents represent the continuous flow of large volumes of water in a definite direction, similar to rivers flowing within the ocean. They are the primary form of horizontal water movement affecting global climate and navigation.
4. Tsunamis (Incorrect): While tsunamis involve massive water movement, they are technically classified as seismic sea waves caused by the displacement of the ocean floor (due to earthquakes or volcanic activity). In standard geographical classification, the "three chief movements" are strictly identified as waves, tides, and currents.

Key Takeaway:
The three fundamental movements of ocean waters are Waves, Tides, and Ocean Currents. Tsunamis are a specific type of high-energy wave caused by endogenic forces, not a primary category of general ocean circulation.

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The correct option is (a).

Explanation

Analysis of the Movements:

1. Waves (Correct): Waves are oscillatory movements where water particles move in a circular motion, primarily driven by friction from winds. They represent the horizontal transmission of energy across the ocean surface.
2. Tides (Correct): Tides are the periodic rise and fall of the sea level, occurring once or twice a day. They are vertical movements generated primarily by the gravitational attraction of the sun and the moon.
3. Ocean Currents (Correct): Ocean currents represent the continuous flow of large volumes of water in a definite direction, similar to rivers flowing within the ocean. They are the primary form of horizontal water movement affecting global climate and navigation.
4. Tsunamis (Incorrect): While tsunamis involve massive water movement, they are technically classified as seismic sea waves caused by the displacement of the ocean floor (due to earthquakes or volcanic activity). In standard geographical classification, the "three chief movements" are strictly identified as waves, tides, and currents.