According to the passage , the term firn refers to __ A. hard and round ice pellets B. light and fluffy snow crystal C. dense and grainy hard ice D. the process of compacting snow E. the process of glacier forming

To determine the correct answer, we need to understand the definition of "firn" as described in the passage. Since the passage is not provided, I will rely on general knowledge about the term "firn."Firn is a type of old snow that has been compressed over time and transformed into a dense, granular substance. It is more solid than fresh snow but not as hard as ice. Firn is often found in regions where snow accumulation exceeds melting and sublimation, such as in polar regions and high-altitude mountains.Given this understanding, let's evaluate the options:A. Hard and round ice pellets - This describes hail or sleet, not firn.B. Light and fluffy snow crystal - This describes fresh snow, not firn.C. Dense and grainy hard ice - This is the closest description of firn, as it refers to the dense, granular nature of firn.D. The process of compacting snow - This describes the process that leads to the formation of firn, but it is not the definition of firn itself.E. The process of glacier forming - This is related to glacial formation, which involves firn but is not the definition of firn.Based on the above analysis, the correct answer is:C. Dense and grainy hard ice