Sweep is the action word because sweep is the only verb found in the sentence
Love this poem. Some of my suggestions for the attitude/tone are reflective, calm and thoughtful, inquisitive and hopeful and even some sadness.
Answer:
Supporting details are reasons, examples, facts, steps, or other kinds of evidence that explain the main idea. Major details explain and develop the main idea.
You should always end on a note that’s likely to stick in the reader’s mind.