Create a balanced multiple-choice practice set

Create 8 original multiple-choice practice questions for first-year undergraduate introductory geology, using this syllabus scope: Rock cycle; differences among igneous, sedimentary, and metamorphic rocks; weathering versus erosion; relative dating using superposition and cross-cutting relationships..

Start with a compact coverage plan mapping the questions to the listed topics. Distribute coverage across the scope rather than predicting what will appear on an exam. Mix factual recognition, interpretation, and simple application where the material allows it.

Give each question four concise choices labeled A-D with exactly one best answer. Use plausible distractors linked to common mistakes, avoid trick wording and 'all of the above', and vary the position of the correct answer. Supply all questions before the answer key so the learner can attempt them first.

In the separate key, give the correct choice, a brief explanation, and why the most tempting distractor fails. Flag any ambiguity or prerequisite outside the supplied scope. Check for duplicate questions and competing correct answers before returning the set. Do not reproduce an existing exam or claim likely exam coverage.