Determining if a terrestrial world is "geologically dead" is a complex and debated issue, as it depends on the criteria used and the evidence available. However, several bodies in our solar system are often considered to be geologically inactive:

Inner Solar System:

* Mercury: While it has some evidence of past volcanic activity, Mercury is considered geologically inactive. Its small size and lack of a significant atmosphere have led to a very thin crust and a lack of internal heat for geological processes.

* The Moon: The Moon has a very thin atmosphere and very little internal heat. It's heavily cratered, indicating a lack of ongoing geological activity. While some evidence of past volcanic activity exists, it is considered inactive.

Outer Solar System:

* Mars: While Mars has a thin atmosphere and evidence of past liquid water, it is considered largely geologically inactive today. It has dormant volcanoes and some evidence of seismic activity, but these are very infrequent.

* Ganymede: Jupiter's largest moon, Ganymede, is the largest moon in our solar system. It has its own magnetic field and a subsurface ocean, but its surface is heavily cratered and shows little evidence of ongoing geological activity.

* Callisto: Another Jovian moon, Callisto, is the most heavily cratered body in our solar system. It shows almost no evidence of geological activity, suggesting it has been geologically dead for a very long time.

Beyond our solar system:

* Many Exoplanets: It is difficult to definitively confirm geological activity on exoplanets, especially those far away. However, some rocky exoplanets are likely geologically dead, particularly those with small sizes and no evidence of volcanic activity or tectonic plates.

It's crucial to remember that "geologically dead" does not mean completely static. Even the most inactive bodies may experience occasional events like meteorite impacts. Furthermore, our understanding of these bodies is constantly evolving as we gather new data.

The question of "geologically dead" is more about the relative lack of active processes compared to other bodies in our solar system. It's a spectrum, with some bodies showing more activity than others. Ultimately, the definition of "geologically dead" remains a subject of ongoing scientific debate.