Portal:Geophysics/Did you know/5


 * ... that the World Digital Magnetic Anomaly Map depicts features such as the Richat Structure, Atlantic ridge, Paris Basin and Chicxulub crater (pictured)?
 * ... that as rocks are compressed, sinking down into an oceanic trench, they release water that causes volcanoes to form above?
 * ... that the North geomagnetic pole is not the same as the magnetic North Pole, and that a compass points at neither?
 * ... that Suiyo Seamount, a seamount near Japan, was thought to be extinct until a hydrothermal event in 1991 was brought to light?
 * ... that Karl Bernhard Zoeppritz was a German geophysicist whose equations use seismic waves to map underground features?