volcanic glass

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obsidian boulders

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Solar system illustration. (planets; sun)

Why Are Planets Round?

Astronomical Observatory of the Mojon del Trigo. Long exposure using the star trail technique. Sierra Nevada National Park, in the province of Granada, Andalusia.

Is Earth Going to Change the Direction in Which It Rotates?

Solar system illustration. (Sun; planets)

A Model of the Cosmos

Paleogeography and paleoceanography of Early Triassic time. The present-day coastlines and tectonic boundaries of the configured continents are shown at the lower right. Continents, continental drift, plate tectonics, Pangea, Laurussia, Gondwana.

Spotting a Supercontinent: How Pangea Was Discovered

Earth from space. Full-hemisphere views of the Earth showing Hurricane Linda at its peak approaching Baja California on 1997 September 11.

What Is Earth’s Velocity?

Discover

Coriander leaves, fresh green cilantro on wooden background, herbs

Why Does Cilantro Taste Like Soap to Some People?

Ice Sledge Hockey, Hockey Canada Cup, USA (left) vs Canada, 2009. UBC Thunderbird Arena, Vancouver, BC, competition site for Olympic ice hockey and Paralympic ice sledge hockey. Vancouver 2010 Olympic and Paralympic Winter Games, Vancouver Olympics

10 Best Hockey Players of All Time

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland

The Largest Islands in the World

The Battle of Gettysburg, July 1-3, 1863. (Civil War, Pennsylvania)

9 Worst Generals in History

World Data Locator Map: Australia

Is Australia an Island?

Orange basketball on black background and with low key lighting. Homepage 2010, arts and entertainment, history and society

The 10 Greatest Basketball Players of All Time

volcanic glass: Media

geology

Images

volcanic glass

volcanic glass

Dark, reflective, obsidian sitting atop gray rocks near the Panum Crater in Mono...

Daniel Mayer

obsidian boulders

obsidian boulders

Obsidian boulders formed from lava flow.

© Steve Estvanik/Fotolia

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