Some like it hot
Another quality to look for when searching for worlds with liquid water (and potentially life) is heat — needed to melt ice and drive chemical reactions. This planetary heat typically comes from two sources — radiogenic heat, driven by radioactive decay inside a planet, and tidal forces, the stretching of planets and moons as they orbit each other, the same force which creates tides on Earth.
This heat can be expelled from inside a planet though two means — continental drift, or volcanoes (including cyrovolcanoes which erupt with water rather than lava). The means by which