Melting icebergs boost sea-level rise

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When an ice cube melts in a glass, the overall water level does not change from when the ice is frozen to when it joins the liquid. Doesn't that mean that melting icebergs shouldn't contribute to sea-level rise? Not quite.

Although most of the contributions to sea-level rise come from water and ice moving from land into the ocean, it turns out that the melting of floating ice causes a small amount of sea-level rise, too.

Globally, it doesn't sound like much – just 0.049 millimetres per year – but if all the sea ice currently bobbing on the oceans were to melt, it could raise sea level by 4 to 6 centimetres.

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Interesting, but as the article states, the difference is based on the mere fraction of a difference in salinity. If it all were to melt at once, it would only contribute 4-6 centimeters.