An underwater volcano in Tonga dramatically changed the global climate by releasing massive steam, not just sulfur.

For a pilot, the first signs of flying into an ash cloud can include sudden darkness, fluctuating airspeed, and landing ...

As the last Ice Age came to an end nearly 10,000 years ago, something unexpected happened deep beneath Earth’s surface. Large glaciers began to melt. The sea levels rose quickly—about 1 centimeter per ...