A Gravity Map of the Earth.
I just came across this on a photo search and I thought I should point outrth Atlantic area has an unusual gravity anomaly. Geologist Vening-Meinesz once remarked that the gravity readings he took in the area south of the Azores indicated to him that there was a sunken landmass in that area.
For some reason I cannot fathom, Lewis Spence was angered by his choice of words when he said this. Spence should not have complained, the great scientist was giving him exactly the evidence that he had been waiting for.
Best Wishes, Dale D.