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What Are Mountains of the Moon?
The Mountains of the Moon, or the Rwenzori mountain range, forms an eighty-mile long backbone on the frontier of Zaire and Uganda in East…
When Was the First Interstellar Radio Message Sent?
The Arecibo Message, humankind’s first interstellar radio message, sent from the Arecibo Observatory in Puerto Rico in 1974, is a three-minute message of exactly…
Why Are There Many Kinds of Soils?
Soil is one of the principal substrata of life on Earth, serving as a reservoir of water and nutrients, as a medium for the…
When Did the Rift Valleys Form?
The great rift valleys of the earth took shape during the pleistocene age, about two million years ago. They were caused mainly by volcanic…
Why Were the Temples of Abu Simbel Moved?
In 1959, an international donations campaign to save the monuments of Nubia began, the southernmost relics of this ancient human civilization were under threat…