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What are the fundamental differences among ocean wave, ocean current and tide?

This question was previously asked in
UPSC CSE 2025 (Prelims) CSAT Official Paper (25-May-2025)

Differences among ocean wave, ocean current and tide are:-

Ocean waves are primarily surface phenomena, caused by the transfer of energy from wind to the water. They involve the oscillation of water particles in a circular motion, with little to no net horizontal displacement of water itself. They are typically short-lived and localized.

Ocean currents are continuous, directed movements of vast amounts of ocean water over long distances, both at the surface and in the deep ocean. They are driven by a combination of factors, including prevailing winds, differences in water density (due to temperature and salinity), and the Coriolis effect. Currents involve the actual transport of water.

Tides are the rhythmic rise and fall of sea level, affecting the entire water column. They are caused by the gravitational pull of the Moon and the Sun on Earth's oceans, creating bulges of water that move around the globe as the Earth rotates. Tides operate on a much longer, predictable cycle than waves.

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