Earth Science

The ground under your feet is running an experiment several billion years long, and earth science is how we read the results so far. This shelf covers the planet as a machine: the rocks it builds, the plates it shuffles, the volcanoes and earthquakes it uses to let off pressure, and the slow chemistry that carves a limestone cave out of solid stone.

Reference guides cover rock types, minerals, crystals and fossils, including how index fossils let geologists date the layers they sit in. Process articles explain the machinery: plate boundaries and what happens at each kind, the water cycle from evaporation to aquifer, weathering and erosion, and the formation stories behind caves, waterfalls, geysers and sea stacks.

Start with the featured guides above for the most-referenced pieces, or browse the full list for a specific rock, landform or process. When a disaster topic comes up, the article sticks to mechanisms and published safety guidance, with no drama added, because the planet supplies enough of its own.