Organisms and populations: the geological backdrop of life. The geological backdrop of life: science of dynamic processes on earth. Study and analysis of rocks and earth processes. We all need minerals in our life and bodies. Earth"s crust seems static to us: however, it is always changing. Earth"s structure: 3 major concentric zones, core. Hot, partly molten rock flows in middle part or asthenosphere: crust. Tend to build up planet"s surface: heat from earth"s formation still being given off. Heat from core provides energy for processes. Causes mantle (asthenosphere) to deform and flow slowly. Source of elements making up living organisms: minerals: naturally occurring in limited deposits. Solid inorganic crystalline element or compound specific chemical makeup. Naturally occupy large areas of earths crust. Formed when molten rock from upper mantle cools. Makes up a lot of the crust. Pre-existing sedimentary or igneous that has been transformed by high temp or high pressure.