Warming ocean and increased melting of land-based ice result from the fact that water expands as it warms., such as glaciers and ice sheets, are the two main sources of global sea level rise. The melting of mountain glaciers and land-based ice sheets, which increases the volume of the ocean by around 2 mm per year combined, and thermal expansion
The ocean water expanding as it heats, account for the majority of the observed sea-level rise (about 3 mm per year) (roughly 1 mm per year). Global sea level changes caused by variations in ocean water volume are known as eustatic sea level changes.
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