# Tides, Waves & Currents

Know that the ocean has tides (water level rises and falls twice a day, caused mainly by the Moon's gravity), waves (caused by wind), and currents (rivers of water flowing through the ocean that carry warmth and nutrients around the world)

Builds on: Coasts & Beaches (hard, https://ai.page/c/coasts-and-beaches/en.md), What Is the Ocean? (hard, https://ai.page/c/what-is-the-ocean/en.md)

Concept id: tides-waves-and-currents. Subject: science. Licence: CC BY-SA 4.0.

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