Research on the Earth's glaciers found that when the volcanoes under the glaciers start to erupt, they will quickly produce steam streams, explosively penetrate the ice layer, release ash into the upper air, and produce zeolite, sulfide and clay. Recently, people have discovered that these minerals have also been detected on some round flat-topped hills on the surface of Mars, and they are widely and abundantly present. 
The geological activities of Mars are not active, and most of the surface landforms were formed in the relatively active period of ancient times.
 it is speculated that the early Mars was covered with ice sheets, where there had been more volcanic activities.