We began with a scavenger hunt, looking for materials to test. The list suggested rocks, but it also included some natural materials, including grass, leaves, twigs, and more.
Lessons learned: Metals conduct electricity. Some metals and alloys are attracted to a magnet, but not all. Most other things do not conduct electricity.
Big lesson: A negative result is as worthwhile as a positive result.
Some highlights in photos:
|Selecting some test specimens.|
|The magnet and specimens|
|The test site for conductivity: Switch, C cell, light and clips. The specimen will complete the circuit.|
|Wax does not conduct.|
|Data collection is neat and organized.|
|Do leaves conduct?|
|But aluminum foil does!|
Next session: Testing rocks and minerals for hardness, streak, etc. By the time we are done, identifying rocks and minerals will be a simple, practical exercise.