---
title: "Why do some rocks float on water?"  
description: "A concise explanation of the reason why some rocks float on water"  
author: "Anjita D."  
published: 2024-01-03  
canonical: https://yourviews.mindstick.com/story/3661/why-do-some-rocks-float-on-water  
category: "science"  
tags: ["some rocks", "float", "water", "science", "facts", "general knowledge"]  
reading_time: 1 minute  

---

# Why do some rocks float on water?

![Why do some rocks float on water](https://yourviews.mindstick.com/stories/362e6015-c078-40de-a839-6e13733ed68d/images/3d9bb449-2f90-4b4b-aead-24c2098254f7.jpeg) ![Why do some rocks float on water](https://yourviews.mindstick.com/stories/362e6015-c078-40de-a839-6e13733ed68d/images/82256aa4-0f47-452a-bd18-3eb0356c5a0c.jpeg) Most rocks sink in water due to their higher density, but some rare rocks can resist gravity due to their low density reached under critical condition ![Why do some rocks float on water](https://yourviews.mindstick.com/stories/362e6015-c078-40de-a839-6e13733ed68d/images/3b1dd836-19d5-463e-99d8-8c6403864cb4.jpeg) Pumice, a lightweight volcanic rock created by fast cooling gas-filled lava, is known as the champion of floating rocks. ![Why do some rocks float on water](https://yourviews.mindstick.com/stories/362e6015-c078-40de-a839-6e13733ed68d/images/5ae6ae09-63af-4ce5-80dc-0ac1983947b7.jpeg) Despite being less dense than water, pumice can hold trapped air for extended periods due to its intricate internal pathways. ![Why do some rocks float on water](https://yourviews.mindstick.com/stories/362e6015-c078-40de-a839-6e13733ed68d/images/73af2b12-87af-4901-be5d-933148b70863.jpeg) When rare rocks with high iron concentrations, such as scoria, mix with water, they emit gas bubbles, lowering their density and creating buoyancy. ![Why do some rocks float on water](https://yourviews.mindstick.com/stories/362e6015-c078-40de-a839-6e13733ed68d/images/9fa2d4b6-c0de-45b4-9819-a3add4afbc7e.jpeg) Iron in scoria can react with water to produce hydrogen gas, causing a temporary lift until the gas escapes.

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Original Source: https://yourviews.mindstick.com/story/3661/why-do-some-rocks-float-on-water

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