"Volcanic hotspots" refers to specific areas on the Earth's surface where volcanoes are created. These spots have a great amount of heat coming from deep within the Earth, causing volcanic activity. Full definition
Washington, DC — Plumes of hot rock surging upward from the Earth's mantle at volcanic hotspots contain evidence that the Earth's formative years may have been even more chaotic than previously... (carnegiescience.edu)
«CT scan of Earth links deep mantle plumes with volcanic hotspots: Scans prove that plumes of hot rock anchored at core - mantle boundary rise to form island chains.» (sciencedaily.com)
Primordial reservoirs in the deep Earth, sampled by a small number of volcanic hotspots globally, have this ancient He - 3 / 4 signature. (sciencedaily.com)