An ice pick is a tool with a pointed end that you use for breaking up a large block of ice into small chunks that you can put in your drink.
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Icebergs are huge chunks of ice that break off from the ice collected around land, or from glaciers that reach the sea. They float, but most of them is underwater and you can't see it, which has coined the phrase "tip of the iceberg" meaning that you can only see a small part of something and the problem is actually a lot bigger than it seems.
Ice cream is a dessert made from frozen milk or cream. Icecream is usually flavoured with sugar, vanilla, fruit or chocolate. Icecream is made by freezing the milk or cream slowly and stirring it frequently so it stays smooth. If you don't stir it, it will be full of crunchy ice crystals and will not be as nice. Icecream is sometimes served in a cone.
Two or more things are identical if they look exactly the same. The two men in the photo are identical twins.
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Identification, or ID, is something you use to prove to other people that you are who you say you are. Most identification has a photograph of you on it. People generally carry some form of identification in their wallet.