Mysterious parallel microtunnels discovered in rock defy geology and could be the work of unknown microscopic ancient life.

Rocks in Australia preserve evidence that plates in Earth’s crust were moving 3.5 billion years ago, a finding that pushes back the beginnings of plate tectonics by hundreds of millions of years.

Handful of lava pebbles thrown into the air. A new study shows how strong shaking at a fault has rocks—briefly—defying gravity. When Julian Lozos, a seismologist at California State University, ...