how to write an open ended investigation experiment, on "what can keep ice from melting?"

An open-ended investigation experiment involves trying
lots of situations with only one factor changed each time, all aiming to answer the same
question. If you want to find out "what can keep ice from melting?" your general
question could be rewritten to ask "In what ways might I keep ice from
melting?"

With that general question as your starting
point, you can begin to create experiments to test various answers. If you put the ice
in a cardboard box on the kitchen counter, will it melt? If you put the ice in a
cardboard box in the freezer, will it melt? If you put the ice in a cooler on the
counter, will it melt? If you put the ice in the cooler in the freezer, will it
melt?

After testing a variety of situations, you should be
able to look at your test results and draw some conclusions regarding circumstances that
would prevent the ice from melting.