Question

a poem reflects on the beauty of nature and encourages people to appreciate the world around them. is this:
central idea
theme

Explanation:

The central idea is the specific message about the topic, while the theme is a broader message or lesson. Here, the poem's message about appreciating nature's beauty and the world is a broader theme (as themes are universal ideas), not just a specific central idea of the poem.

Answer:

blue box: theme