What type of volcanic structure does not currently show any signs of activity and is considered unlikely to erupt again?

An extinct volcano is characterized by a complete lack of activity, indicating that it is unlikely to erupt again in the future. This classification is based on geological assessments, which show that the last eruption occurred so long ago that there is no expectation of future volcanic activity. Extinct volcanoes have typically weathered and eroded over time, and their magma reservoirs are considered to be depleted.

In contrast, active volcanoes show current volcanic activity or are expected to erupt in the near future, while dormant volcanoes, though currently inactive, have the potential to erupt again. Cinder cone volcanoes are a type of structure that can be either active or dormant but do not inherently indicate whether they will erupt again. Therefore, the designation of a volcano as extinct clearly reflects its unlikelihood of future eruptions.