biosphere extends into the saturated zone of the continental and oceanic crusts to the depth at which the temperature exceeds the limit that microorganisms can endure,
around 120 C (250 F) = depths of 5 km (3 mi) in continents and 10.5 km (6.5 mi) below the ocean surface.
An Energetic Perspective on Groundwater. Almost three years ago EEH Newsletter #97 focused on supporting humanity's collective awakening process through the waters of the Earth. That newsletter
focused on Earth's surface waters. With a global focus on groundwater now, I have only just realized how profoundly the waters of the Earth serve as a unifying medium for all of life and the geology of the upper crust. Groundwater in the saturated zone fills the pore space of even the most slowly permeable geologic material, extending from near the Earth's surface in wetland soils to around 100 m/330 ft where the unsaturated zone is especially thick. As shown in the figure above, microbial life
inhabits groundwater to depths of around 5 km (3 mi) in continental crust and 10.5 km (6.5 mi) below the ocean surface in oceanic crust. Groundwater magnificently connects biology and geology, just as the Upper Mantle provides unifying support from below.