Want to know how powerful ice can be?

This is an activity you should do with the help of your parents or other responsible adult. You should not do this on your own.

Get an empty wine bottle with a cork. Fill it full of water. leaving only just enough room for the cork to be pushed home. Now fit the cork.

Put the bottle on a plastic shopping bag and put it in the freezer. Leave for a day, then take the bag out of the freezer and look at the bottle.

Take a digital picture of the result and compare it with pictures of other bottles that your friends have frozen at home.

You are likely to find the cork pushed out of the bottle and the bottle cracked. This will have happened because water swells as it freezes. Because you fitted the cork tightly, the water could not expand out of the top and so it broke the bottle. Now you can see why rocks with water in crack during frosts.