What appropriate term is used for statements that elaborate on the main idea of a text?

The appropriate term for statements that elaborate on the main idea of a text is "Supporting Details." These details provide evidence, examples, and explanations that reinforce and clarify the main idea, helping readers to better understand and engage with the content. Supporting details can include facts, statistics, anecdotes, and descriptions that deepen the reader's comprehension of the topic being discussed.

In contrast, themes represent the overarching messages or moral lessons within a text, while main ideas summarize the central point. Topics refer to the subjects discussed but do not necessarily provide elaboration on those subjects. Supporting details are thus essential for developing and substantiating the main idea, making them a crucial component of effective writing and comprehension.