Earthquakes under the sea can trigger off great avalanches of mud and sand. These can cause undersea currents strong enough to snap underwater cables. Telephone cables broke under the Atlantic Ocean, after the earthquake off Newfoundland in 1929.

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Source: https://www.pitara.com/non-fiction-for-kids/did-you-know-for-kids/earthquakes-under-the-sea-can-trigger-off/

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