Human: What is the difference between a glacier and an iceberg? Assistant: 
The main difference between a glacier and an iceberg is that a glacier is a large mass of slow-moving ice on land, while an iceberg is a large floating piece of ice that has broken off from a glacier or ice shelf. Glaciers are formed by the accumulation of snow over a long period of time and often move in a slow and steady motion, while icebergs can form quickly and can break apart in large chunks due to the strong ocean currents in which they travel.