Answer:
Geology is the study of the earth and how it changes.
Ricochet is the rebound that happens when you fire a gun at an object that deflects the bullet. In other words, fire all you want at Sia because anything negative will just be deflected.
Lyrically, Sia’s referring to the criticism and negativity that’s directed at her – the bullets – but she won’t be affected at all. She’s strong and immune to it like titanium is to bullets.
Hope this helps.