# On the slope of Mount X, precipitation falls only in the form of snow and is 5,000 mm / year. 7% of precipitation evaporates.

On the slope of Mount X, precipitation falls only in the form of snow and is 5,000 mm / year. 7% of precipitation evaporates. The thickness of the glacier on this slope is 15.4 m. Determine the age of the ice in the lower layer of the glacier.

1) The formation of firn ice 1 m thick requires 11 m of snow. Let us determine the amount of snow required to form a 15.4 m thick glacier using the proportion:
1 m ice – 11 m snow
15.4 m ice – X m snow, from here
X = 15.4 mx 11 m: 1 m = 169.4 m
2) 7% of the snow evaporates. Let’s determine how much snow is compressed and turns into ice annually:
5000 mm = 0.5 m
0.5 m – 0.5 m × 7%: 100% = 0.465 m
3) Let’s determine how many years have passed since the beginning of the formation of the glacier:
169.4 m: 0.465 m = 364.3 years
Answer: the age of ice in the lower layer of the glacier is 364.3 years.

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