What are the poetic techniques and literary terms in Robert Frost's poem "There are Roughly Zones"?

Robert Frost's poem "There Are Roughly Zones" recounts a casual conversation between two people, who are meditating on the power of nature and the relationship between man and nature. The poem features alliteration, imagery, rhetorical question, and rhyme scheme.
The poem includes several examples of alliteration. In line 2, the speaker writes, "And every gust that gathers strength and heaves." There is alliteration if the "g" at the start of "gust" and "gathers." That alliteration adds a bit to sense that nature can be harsh and unforgiving.
The two people are conversing about the wind and the world outside, which we know from the repeated use of the pronoun "we," as well as the choice of verbs. As they consider the weather, they think,

We think of the tree. If it never again has leaves,
We'll know, we say, that this was the night it died. (4-5)

This is an implicit way to say that the characters in the poem have agreed that this weather is so harsh it may mean that the tree will never again bear leaves. This could also be considered an example of hyperbole, or exaggeration.

Next, there is a rhetorical question, which the speaker asks in reflection on what he and his companion have just been discussing:


What comes over a man, is it soul or mind
That to no limits and bounds he can stay confined? (7-8)



The speaker asks why man cannot be limited or stay in "his place" or a place. Given what he was just thinking about regarding nature, we could rephrase this question to say something like "why does man insist on meditating on things that do not concern him? or "why does man feel the impulse to consider abstract, universal, or metaphysical concepts?" The rhetorical questions allow the speaker to introduce what will become a central idea of the poem: ambition.

Though the speaker does not use a question mark, the next thought is basically another rhetorical question that furthers the first:


Why is his nature forever so hard to teach
That though there is no fixed line between wrong and right,
There are roughly zones whose laws must be obeyed.
There is nothing much we can do for the tree tonight.
But we can't help feeling more than a little betrayed
That the northwest wind should rise to such a height
Just when the cold went down so many below. (11-17)



The "roughly zones" of line 12 and the title refer to boundaries that are somewhat fluid. Yet man continues to try to go beyond them. He then allows that "There is nothing much we can do for the tree tonight." Man has no real power over nature, and even though there is really no connection between their lives and the tree's fate, "we can't help feeling more than a little betrayed." The people take the weather personally, as though all acts of the environment are reactions to human behavior. This shows humans' dependence on and connection to nature but also man's arrogance.

Eventually, the speaker ends the poem by asserting that if the tree never grows leaves again, it is man's fault: "this limitless trait in the hearts of men." The tone changes a bit in the second half of the poem, as the speaker seems more critical of mankind. He is stating here that man's ambition and inability to keep to the "roughly zones" is what destroys nature, not nature itself.

The poem as a whole features imagery, through which we can imagine what the tree looks like. Most of the text is presented as a dialogue, though spoken through only one voice which unites the two characters' ideas. The poem features a rhyme scheme, though it does not follow a strict structure in terms of stanzas or poetic form.