The forces of nature make Earth a restless planet, but they also turned our ball of rock into a home for life. How did our planet's ingredients, the chemical elements, come together and take that first crucial step from barren rock to a living world?
The forces of nature have kept Earth on the move since it was formed billions of years ago. Though we can't feel the motion, we experience the consequences — from tidal bores surging through the Amazon rainforest to the ruinous power of hurricanes.
We can't directly see the forces that govern Earth, but we can see their shadows in the shapes of nature that surround us. If we understand why these shapes exist, we can understand the rules that bind the entire universe.