Glaciers play an important role in the water cycle and global warming. Which are true of the following statements ? (check all that apply):

Question

Glaciers play an important role in the water cycle and global warming.  Which are true of the following statements ? (check all that apply):

BlackTom AI · Accepted Answer

The question asks you to select all statements that are true about glaciers in the context of the water cycle and global warming. We'll examine each option carefully before identifying which are correct.
Option 1: 'Glaciers used to cover much of the earth during past Ice Ages' This is true. During past Ice Ages, large continental ice sheets and alpine glaciers expanded, covering significant portions of the continents and lowering global sea levels. The evidence from geology and paleoclimatology supports extensive glaciation in large regions.
Option 2: 'When glaciers are frozen on land they contribute to sea level rise' This is false. Glaciers that are on land store water as ice; when they advance (grow) they can cause sea level to fall slightly if more water is stored on land, and when they melt, they contribute to sea level rise. The phrasing implies that being frozen on land inherently raises sea level, which is incorrect—the relationship depends on the balance of accumulation and melt, but frozen-on-land glaciers do not automatically elevate sea level.
Option 3: 'Glaciers are mobile and over time carve out valleys and move earth' This is true. Glaciers flow slowly due to gravity, eroding landscapes and carving features such as U-shaped valleys, fjords, and cirques through processes of abrasion and plucking.
Option 4: 'They store a lot of carbon, helping to mitigate global warming' This is false. Glaciers themselves do not store significant amounts of carbon. The carbon cycle is more directly tied to soils, vegetation, permafrost, and oceans. Glaciers influence climate indirectly (eby albedo and freshwater input), but they are not major carbon reservoirs.
In summary, options 1 and 3 are true, while options 2 and 4 are not supported by standard glaciology and climate science.

Glaciers play an important role in the water cycle and global warming. Which are true of the following statements ? (check all that apply):多项选择题

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