Have each student sketch their patterns and write a short paragraph explaining what they can infer about the way real glaciers affect the landforms over which they move. Discuss with the class how patterns of glaciation provide clues to the climate in a particular area over time. Back to Top 1. Speculate why icebergs are so hard to destroy. List your reasons.
Water expands when it freezes.
This is the underlying reason why an iceberg floats it is less dense than water. Speculate whether icebergs could be used constructively as a resource for freshwater. Discuss thermohaline circulation and its global effects. Analyze the global effects of the current annual increase in icebergs. Relate the analysis to present-day processes.