If It Keeps Going…

Many of us have been following the goings-on at the Yellowstone caldera.  With a tip from Robert Sommerville, I stopped in a Green Gabbro and saw this item explaining GPS receivers and ground deformation caused by magma inclusion:

The instrument in this photo is the GPS station from White Lake, Wyoming. For the past several years, it’s been moving upwards at a rate of about 4 cm/yr - if it keeps going, which it obviously won’t, it would take about 10 billion years to get to the moon.

Many mistakes have been made by extrapolating a trend into the future!

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