Mud at the bottom of this lake holds a record showing how humanity has been changing our planet. But the Anthropocene isn’t an official new epoch yet.
The eruption plume spawned lightning that started 20 to 30 kilometers (some 12 to 19 miles) above sea level.
Tectonic plates are giant slabs of rock that make up Earth’s outer layer.
Lake Mercer may serve as a model for better understanding the birth and life of Antarctica’s hundreds of subglacial lakes.
Seismology is the branch of science focused on seismic waves — vibrations that run through or around Earth.
Bits of airborne salt may help raindrops form, removing water from clouds before it can freeze as part of the process that makes lightning.
The force of friction always acts to slow things down. It depends on just two factors: the surfaces and how hard they press together.
Inland melting of the Northeast Greenland Ice Stream is accelerating — and may contribute far more to sea level rise than earlier estimates suggested.
A massive volcanic eruption in the South Pacific, earlier this year, appears to have triggered one tsunami that was initially 90 meters (nearly 300 feet) tall.
