Related topics: earth

Why did Mars dry out? New study points to unusual answers

Mars once ran red with rivers. The telltale tracks of past rivers, streams and lakes are visible today all over the planet. But about three billion years ago, they all dried up—and no one knows why.

Giant tooth of ancient marine reptile discovered in Alps

The fossils of three ichthyosaurs—giant marine reptiles that patrolled primordial oceans—have been discovered high up in the Swiss Alps, and include the largest ever tooth found for the species, a study said Thursday.

Scientists scour 'Mexico's Galapagos' for quake, volcano clues

Could a volcanic eruption off Mexico's coast unleash a tsunami like the one that devastated Tonga? What really causes tectonic plates to shift and trigger earthquakes? Scientists visited a remote archipelago in search of ...

Seafloor spreading has been slowing down

A new global analysis of the last 19 million years of seafloor spreading rates found they have been slowing down. Geologists want to know why the seafloor is getting sluggish.

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