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Alan try the english 'dough'
“Researchers at the University of Maryland have constructed a 30-ton sphere that spins at more than 90 mph to generate magnetic fields. The 10-ft.-dia. sphere is filled with 13.5 tons of liquid sodium to mimic the Earth’s liquid-iron center core. A 3.3-ft.- dia. stainless-steel sphere inside the larger one counterrotates to approximate the motion of the planet’s solid iron inner core. The action of Earth’s inner liquid produces a magnetic field that makes compasses work, deflects harmful cosmic rays and protects the planet from solar wind. The field reverses every couple of hundred thousand years. By using a model instead of a computer simulation, scientists hope to determine how these reversals occur and predict the next one
PS an 100m diameter sphere filled with molten Sodium would be a rather large experiment and might be difficult to fund.
Average Temperature, a PredictionI predict that terra-tunnellers millennia hence shall measure the average temperature of the Earth where the loci of average mass intersects the temperature gradient. I predict that the temperature shall be measured as 1,758C (plus or minus 2C accounting for thermometer error), at a uniform depth of 1,758km beneath the surface of the Earth, provided that no one lights a campfire on the surface above a measuring location.DisappointmentI had hoped with this exercise to finally put to rest one of the great unsolved mysteries of science. Sadly I find that on reflection this exercise is of no comfort there. So we must wait for one far greater than me to emerge and confirm whether the Earth is round, or whether it is flat. Sigh