
Earth
Scientists Say: Richter Scale
The Richter scale and other magnitude measures reveal the strength of an earthquake.
The Richter scale and other magnitude measures reveal the strength of an earthquake.
The word avalanche usually refers to a huge snowslide down a mountain, but it can also be used to describe any large mass of material tumbling downhill.
Earthquakes usually last seconds. But sometimes, they can last days, or even years. Here’s what scientists are learning about these “slow-slip events.”
The word magma refers to molten rock deep inside Earth. That rock is called lava when it reaches Earth’s surface.
Molten rock rising from the deep mantle at the Mid-Atlantic Ridge may drive plate tectonics there more than had been expected.
An earthquake is a sudden and sometimes violent shaking of the ground.
Explore the sizzling heat, unimaginable pressures — and some surprise diamonds — that sit beneath our feet. This is the side of Earth that you can’t see.
Geologic time is unimaginably long. Geologists puzzle it out using a calendar called the Geologic Time Scale.
A government volcano expert answers burning questions about the ongoing Kilauea eruption.
Methane explosions 12,000 years ago left huge craters in bedrock on the Arctic seafloor. Scientists worry more could be on the way today as Earth’s ice sheets melt.