https://www.space.com/36863-giant-lava-lamp-hidden-inside-earth.html
Giant 'Lava Lamp' Inside Earth May Cause Magnetic Poles to Flip | Space
May 16, 2017 - Geoscientists have discovered that regions on top of the Earth's core could behave like giant lava lamps, with blobs of rock periodically rising and falling...
giant lava lamp