Any geologically-active place with thick ice will also have thin ice.
Or water-filled cracks. Somewhere. The geysers prove this. Water didn't just suddenly decide to plow through miles of unbroken ice.
Space/Science » in reply to Check out Richard Greenberg's book Unmasking Europa
Or water-filled cracks. Somewhere. The geysers prove this. Water didn't just suddenly decide to plow through miles of unbroken ice.