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Do you remember the North Pole as a huge white ice surface (no land mass!) on old world maps and globes? If you look at old maps from the 1990s and prior now there is no North Pole anymore at all. But I remember seeing this white ice surface on world maps back when I was a child and teenager (late 90s, early 2000s).
Like i said, get a vat of saltwater and some ice cubes and try it for yourself. I’ve done this experiment and it’s small but measurable. There are many factors that contribute to sea level, and water being deposited onto land from precipitation is only one of them.
The rain thing is a red herring, but i’ll play. All of the water from both sea ice and rain comes from ocean water, however the water that is added from rain has been extracted from the ocean recently. This cancels out the addition of rain water, because it was subtracted in the first place to become rain. The salinity also stays the same because the salt stays behind when the water evaporates, and equals out when the rain is reintroduced. The water stored in ice was extracted from sea water millions of years ago and is now being reintroduced into the ocean, which causes deviation from the current salinity of the ocean.
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The majority of rain comes from the evaporation of sea water in the ocean, so of course it’s not going to contribute. Just because something doesn’t make sense to you doesn’t make it untrue. You can try it with salt water and fresh water ice cubes at home if you’re that determined