Final answer:
The sentence 'Olympus Mons is one of the most recognizable and important landforms on Mars.' from the student's report is an example of plagiarism because it is a direct copy from the source text without proper citation.
Step-by-step explanation:
The sentence in the student's report that plagiarizes the text from Mysteries of Mars! by Etna Vesuvius is "Olympus Mons is one of the most recognizable and important landforms on Mars." This sentence is copied verbatim from the source text without proper quotation or citation, constituting plagiarism. When writing reports, students should always paraphrase the original text or use direct quotes with citations to avoid plagiarism.