geoacoustic

The story

1. Proto-Hellenic*gaya
2. Ancient Greekγαῖᾰ (gaîă)clip.
3. Ancient Greekγῆ (gê)
4. Ancient Greekγεω- (geō-)
5. Englishgeo-
6. Proto-Indo-European*h₂eḱ-
7. Proto-Indo-European*h₂ew-
8. Proto-Indo-European*h₂ṓws
9. Proto-Indo-European*h₂ḱh₂owsyéti
10. Proto-Hellenic*akóuhō
11. Ancient Greekἀκούω (akoúō)
12. Ancient Greekᾰ̓κουστῐκός (ăkoustĭkós)
13. Medieval Latinacousticus
14. Englishacoustic
15. English todaygeoacoustic

From geo- + acoustic.