The document outlines the process of ice sheet formation and movement in 4 steps: 1) snowfall accumulates and compresses to form an ice sheet, 2) pressure causes basal melt, 3) the lubricated ice sheet moves via basal slippage due to gravity, 4) the ice sheet flows out to sea forming an ice shelf, which periodically calves icebergs in summer. The reader is instructed to copy the diagram as it progresses through each step, swapping sheets with a partner between diagrams.

10. Snow fall Accumulates and compresses – ice sheet

11. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt.

12. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage .

13. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage . Ice sheet flow out onto the sea- ice shelf.

14. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage . Ice sheet flow out onto the sea- ice shelf. Calving occurs in summer Iceberg

23. Snow fall Accumulates and compresses – ice sheet

24. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt.

25. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage .

26. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage . Ice sheet flow out onto the sea- ice shelf.

27. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage . Ice sheet flow out onto the sea- ice shelf. Calving occurs in summer Iceberg

36. Snow fall Accumulates and compresses – ice sheet

37. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt.

38. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage .

39. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage . Ice sheet flow out onto the sea- ice shelf.

40. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage . Ice sheet flow out onto the sea- ice shelf. Calving occurs in summer Iceberg

49. Snow fall Accumulates and compresses – ice sheet

50. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt.

51. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage .

52. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage . Ice sheet flow out onto the sea- ice shelf.

53. Snow fall Accumulates and compresses – ice sheet Pressure causes basal melt. Ice sheet moves-Lubricated due to basal melt and gravity- basal slippage . Ice sheet flow out onto the sea- ice shelf. Calving occurs in summer Iceberg