Salt doesn’t necessarily melt ice, it just lowers the freezing point of the water that composes the ice, meaning that water has to reach a lower temperature in order to freeze. My guess is that the oceans in the Arctic and Antarctic are so cold, that it negates the effect of the salt on the ice, but I’m not a scientist or anything
You have several misconceptions here. Salt doesn’t melt ice, it just lowers the freezing point of water so water has to be colder to freeze and ice will melt and colder temperatures. Also, glaciers are not on water. A glacier is, by definition, on land.
Now if you’re asking about sea ice, yes, salt in the ocean lowers the freezing point of the water slightly from 32 degrees F (0C) to about 28.5 F (-2C), but there’s still (for the time being) sea ice that’s below 28.5 degrees, so it doesn’t melt.
Salt doesn’t melt ice.
It changes the freezing point of the water.
So instead of water changing from liquid to solid at 0C, that number decreases. How much it decreases depends on how much salt you add. The actual scientific concept is called “freezing point depression” and you can calculate the exact new freezing point if you know how much salt is added, but it’s not very ELI5.
The reason it seems like it melts the ice is because most places don’t maintain a constant temperature of -20C, which is relatively easy to depress water to with icemelt pellets. So, the ice then melts because it isn’t cold enough for it to stay frozen with the newly depressed freezing point.
If you try using salt to melt ice in places where it’s freakishly cold, it doesn’t really work very well.
The glaciers exist in places (the Arctic and Antarctic), which are generally freakishly cold.
I think you mean icebergs?
Glaciers are rivers of ice. They don’t touch salt water as a general rule, except where the river meets the sea.
Icebergs are giant hunks of ice floating in the ocean.
Salt lowers the freezing point of water, which is why it can cause ice to melt. But it does not remove the freezing point altogether. At about 28.4F, saltwater will freeze. That is the point at which salt will no longer melt ice, and that is the temperature at which icebergs can survive in saltwater.
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