Final answer:
The poem contains three stanzas, and each stanza consists of five lines. These stanzas structure the poem's thematic emphasis on the ongoing cycle of the tides and life.
Step-by-step explanation:
The poem provided contains three stanzas. Each stanza comprises five lines, making it a quintain, which is a stanza or poem of five lines. Stanzas are like paragraphs in prose, organizing thoughts and creating a rhythm through their structure. The provided poem emphasizes the perpetual motion of the tides and the passage of time, a common theme in poetry that evokes the ceaseless ebb and flow of life's events.