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Hard water (or 'lime') scale.

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βˆ™ 10y ago
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βˆ™ 6mo ago

The presence of sediment or mineral deposits at the bottom of the kettle can indicate that rocks have dissolved in the water. Additionally, a rough or pitted surface inside the kettle may also suggest the erosion caused by dissolved rocks.

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Q: What evidence from inside kettles suggests that some rocks dissolve?
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