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ice
Because it is frozen sea water. A glacier is frozen fresh water.
Volume increases, and there is a change of phase from liquid to solid.
in fresh water rivers where most waterfalls are
Normally called a glacier.
probably glaciers I'm not sure
If the fresh air intake has a filter, you can change it as necessary. I would imagine once a year would enough.
It changes because it feels like it wants to change to salt or fresh every time ti wannas :)
5. No change is necessary
By keeping it frozen. Unfortunately global climate change has had a detrimental effect on most glaciers. In 1910 there were 150 glaciers in Montana's Glacier National Park, by 2010 there were barely 25 left.
By all means necessary, a dog should always have a bowl of fresh water. Changing the water is necessary after every time the dog has it's drinking session.
Fresh lemonade is an example of a physical change. Nothing changes chemically between the components when mixed together. They only combine into a consistent homogeneous mixture.