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Caves Around the World

Caves are natural wonders that have fascinated humans for centuries. From massive underground networks to hidden chambers with stunning rock formations, caves offer a glimpse into the geological…

Grand Canyon

(Encyclopedia) Grand Canyon, great gorge of the Colorado River, one of the natural wonders of the world; c.1 mi (1.6 km) deep, from 4 to 18 mi (6.4–29 km) wide, and 217 mi (349 km) long, NW Ariz. The…

Teilhard de Chardin, Pierre

(Encyclopedia) Teilhard de Chardin, PierreTeilhard de Chardin, Pierrepyĕr tāyärˈ də shärdăNˈ [key], 1881–1955, French paleontologist and philosopher. He entered (1899) the Jesuit order, was ordained…

Meaning of aa

The Question: What is "aa"? The Answer: Aa can be a very useful word in Scrabble. It is a variety of flow lava which has a rough…

How Many Continents Are There?

Source: iStock Like a large jigsaw puzzle, the surface of the Earth is divided up into interlocking pieces that form the world we know today. And when it comes to the number of continents, it hasn’t…

Miranda

The smallest of Uranus's large moons, Miranda, 293 mi (472 km) in diameter, has been described as “the most bizarre body in the solar system,” with the most geologically complex surface. Miranda's…

Theories of the Universe: Curved Space

Curved SpaceTheories of the UniverseCracks in a Newtonian WorldFaster Than a Speeding Light WaveIt All Depends on Your PositionThe Relative Nature of Space and TimeGeological TimeHow Can You Be in…