Explain the origin of varves and their significance in the chronologies of glacial lake deposits. What will be an ideal response?
Varves are laminated silts and clays that are deposited in glacial lakes and marine waters beneath
regions of fluctuating sea ice cover. The darker layers are deposited at the end of the summer season
when the summer's life dies and becomes incorporated in the accumulating sediment. The lighter- and
finer-grained layers are deposited during the winter when the water is still, lacking abundant life, and
receiving little sediment. Thus, each light and dark pair represents one year's accumulation.
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Answer the following statement true (T) or false (F)
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Indicate whether the statement is true or false