By ensuring the ambient temperature is below the melting point of the ice.
Move the ice into a freezer.
They are scattered on the iced surface to stop the ice from melting and slow down the melting.
By keeping it cold.
By keeping it cold.
sawdust
They are scattered on the ice surface to stop the ice from melting and slows down the melting process
put it in the freezer ;)
Freezing Temperatures
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There is no indication that they will stop melting (technically, they really wouldn't stop even if the earth weren't warming). Much of the area of the ice caps has been observed to be accelerating in melt, in fact.
Leave it in the freezer.
It insulates it, keeping the cool in and the heat out.