Category: geology

Technology: how a metal detector works

The tutor gives a nontechnical explanation of how a metal detector functions. Watching Curse of Oak Island on the History channel, you see them use metal detectors. How does a metal detector work? A basic explanation is this: The search

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Minerals: what is corundum? Rubies in Cape Breton, Nova Scotia

Tutoring science, one might expect questions like these more often. The tutor seeks the answer to another childhood curiosity…. I remember seeing Mohs’ hardness scale when I was a kid. On it, quartz is 7, corundum 9, and diamond 10.

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