You are told that a region has no glaciers. What does the lack of glaciers tell you about the climate of that region?

Question

BlackTom AI · Accepted Answer

Glaciers form when the long-term accumulation of snow (and ice) exceeds the long-term losses from melting, sublimation, calving and other ablation processes. The key climate concept is glacier mass balance: mass balance = accumulation − ablation. If this balance is negative year after year, glaciers cannot persist.

Step-by-step reasoning:
1. Define terms: accumulation is primarily snowfall that survives the summer and compacts into ice; ablation includes melting, sublimation, and ice loss.  
2. Write the mass-balance condition: if accumulation − ablation ≤ 0 over successive years, ice mass will shrink and a glacier will disappear. Conversely, accumulation − ablation > 0 allows glaciers to form and grow.  
3. A region with no glaciers implies the long-term mass balance is not favorable for ice retention. Therefore ablation (mainly melting in most climates) exceeds accumulation (snowfall), so ice cannot be sustained.

Why the correct answer is correct:
- "Melting exceeds snowfall" directly restates the negative mass-balance condition. If melting and other losses remove more ice than is replaced by snowfall, glaciers will not form or will disappear.

Why the other options are incorrect:
- "The average temperature is well above freezing." Not necessarily true: glaciers can exist in places with warm summers if winter snowfall and/or cold conditions at higher elevations preserve ice. Glacier presence depends on net balance, not just mean annual temperature.
- "Snowfall is rare or absent." A lack of glaciers does not require negligible snowfall; a region could get substantial snow but warm enough seasons to melt it all. Conversely, some polar glaciers persist with very low snowfall because ablation is minimal.
- "The land is rising" and "The land is sinking." Tectonic uplift or subsidence affects local topography and sea level but does not by itself determine glacier presence; the decisive factor is climatic mass balance.

Conclusion: The absence of glaciers indicates melting (ablation) exceeds snowfall (accumulation), so the correct answer is "Melting exceeds snowfall."

You are told that a region has no glaciers. What does the lack of glaciers tell you about the climate of that region? 单项选择题

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