Environmental Science
The Biosphere
Quick fact
Although the biosphere spans from the upper atmosphere to deep ocean trenches, about 90% of all Earth's biomass is concentrated in the top few meters of soil and the ocean's sunlit surface.
Why this is interesting
You live in a thin, fragile layer of life surrounding Earth—yet this layer is more complex and interconnected than any machine humans have built. What is this layer, and how does it sustain everything we know?