Weathering is very slow. The height of some mountains is lowered by about 8.6 cm (three and a half inches) every 1,000 years. At this rate a mountain only as tall as the Eiffel Tower would take over three million years to wear right down.

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Source: https://www.pitara.com/non-fiction-for-kids/did-you-know-for-kids/weathering-is-very-slow-the-height-of-some/

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