Earth & The Planet
How Earth’s Magnetic Field Reverses
Ancient rocks record changes in magnetic polarity. Reversals reflect the changing geodynamo deep inside Earth, not the planet physically turning upside down.
Sep 30, 2026 • 4 min readOUR LIVING PLANET
Geography
Explore places, landscapes and spatial patterns, including the maps and measurements used to describe a changing world.
EDITOR’S PICK
How Do Sand Dunes Move?
Sand dunes migrate when wind transports grains up their windward slope and deposits them near the crest. Sand then avalanches down the steeper sheltered side. Repeating that cycle shifts the entire landform downwind even…
Oct 6, 2026 • 3 min readRead the discovery →LATEST
Latest discoveries
New stories, explanations and research from Geography.
Earth & The Planet
How Sinkholes Form Beneath Solid Ground
Sinkholes develop when underground material is removed and the surface subsides or collapses. Soluble rock, sediment and groundwater changes shape how—and how quickly—they appear.
Sep 30, 2026 • 3 min read
Earth & The Planet
How River Deltas Build Land—and Why They Sink
Deltas grow when rivers deposit sediment faster than waves, currents and sinking remove it, but dams, extraction and rising seas can upset that balance.
Sep 29, 2026 • 2 min read
Earth & The Planet
How Rivers Create Meanders, Cutoffs and Oxbow Lakes
Meandering rivers reshape floodplains through erosion, sediment deposition and channel cutoffs. An oxbow lake is one stage in that evolving landscape, not a permanent…
Sep 28, 2026 • 3 min read
Earth & The Planet
How Seismic Waves Reveal Earth’s Hidden Interior
Earthquakes send different kinds of waves through the planet, allowing researchers to map boundaries, materials and motion far below any drill.
Sep 19, 2026 • 6 min readWORTH KNOWING
Popular & evergreen
Earth & The Planet
How Seismic Waves Reveal Earth’s Hidden Interior
Earthquakes send different kinds of waves through the planet, allowing researchers to map boundaries, materials and motion far below any drill.
Sep 19, 2026 • 6 min read