Final answer:
The 4-line stanzas in “A Psalm of Life” are called quatrains, which are a common stanzaic form in English poetry with a typical rhyme scheme of ABAB.
Step-by-step explanation:
The 4-line stanzas in the poem “A Psalm of Life” by Henry Wadsworth Longfellow are known as quatrains. In poetry, a quatrain is a stanza with four lines that may have various rhyme schemes, such as AABB, ABBA, AABA, or ABCB. The rhyme scheme of Longfellow’s poem is generally ABAB, which is a common structure for quatrains. Additionally, quatrains are the most common stanzaic form in English poetry and are often used in various poetic forms such as ballads and sonnets.