What are some important questions of poem Dust of snow

Dear Student,
1. Why does the mood of the poet change?
2. What is the theme of the poem?
3. Why does the poet call it the dust of snow?

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https://www.meritnation.com/cbse-class-10/english/first_flight/dust-of-snow-poem-/popular-questions/12_7_22_1864
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