Brain Teaser Challenge - "January" 2010†

Parker Peter was a science nerd. One day his school went for a field trip to a laboratory where they experiment with genetically altered earthworms. As the students were visiting the specimen cases, he discovered that one of the slithering mutants had escaped. Then while he was distracted taking pictures of the lab assistants, the errant annelid managed to sink its fangs (I did say it was a mutant, right) into the unsuspecting Parker. Naturally, Parker experienced only mild side effects as his body was transformed into that of a superhuman with all of the powers of a very large earth worm.

Aside from the ability to asexually reproduce, Wormboy also gained the ability to flatten his body so he could slide under the door to enter a locked room and borough in the soil. His arch enemy, The Bass Fisherman, discovered that passing an electric current through the ground would force Wormboy to come to the surface and reveal his whereabouts. BF decided to measure the bulk resistivity of the soil with four probes 1 cm apart and got 20 ohms. What is the bulk resistivity of this soil?

Reply to Butch Shadwell
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The names of correct respondents may be mentioned in the solution column.

† Our friend Butch volunteers a bit too much, he never quite catches up to the current month.