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A student has a black rock that does not reflect light. The student cuts it open and the inside is the same as the outside. Can the student determine if this rock contains iron simply by looking at it?

A. Yes. The student would know that black rocks do not contain iron.

B. Yes. The student would be able to see silver specks if the rock contains iron.

C. Yes. The student can use a microscope to see if the rock contains very small pieces of iron.

D. No. The student would not be able to see if the rock contains iron, even with a microscope.

E. No. The student cannot look at the rock since it does not reflect light and is therefore invisible.



bold = correct answer

Question Identifier: GCI_2011_084
Designed for: Non-Science Majors
Primary Author(s): J. Libarkin, S. Anderson
Contributing Author(s):
Misconception's Reference: Original GCI (https://www.msu.edu/~libarkin/GCI_PUBLICATIONS.html)
Notes: This question is NOT appropriate for students who are familiar with optical mineralogy techniques.