Question

And who art thou? said I to the soft-falling shower,
Which, strange to tell, gave me an answer, as here
translated :
I am the Poem of Earth, said the voice of the rain
Eternall rise impalpable out of the land and the
bottomless sea,
Upward to heaven, whence, vaguely form'd, altogethe
changed, and yet the same.
(a) How is the speaker the poem of the earth?
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Answer 1

Answer:

The speaker is considering himself/herself the poem of the Earth as the rain, which the poet has mentioned that it forms vaguely somewhere in the sky and (in the clouds) and even gives rises to seas and rivers from the deep bottom.

Explanation:

Rain is the poem of the Earth because without Rain our lives will be impossible, as rain provides us with water for the crops to grow, which we eat, it provides us with rainwater, which we store for various purposes and also it gives birth to many rivers and seas.