What condition is necessary for a glacier to form? more snow falling than snow melting

more rain falling than ice melting

steep slopes for ice to flow down

a valley to accumulate ice

A) more snow falling than snow melting

Explanation:

"Three conditions are necessary to form a glacier: (1) Cold local climate (polar latitudes or high elevation). (2) snow must be abundant; more snow must fall than melts, and (3) snow must not be removed by avalanches or wind"

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mathematical model hope this