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DK Earth: Rivers

HOW DO RIVERS BEGIN? WHAT IS A RIVER’S LOAD? HOW DO RIVERS SHAPE THE LANDSCAPE? WHAT IS AN ESTUARY? HOW ARE DELTAS FORMED? LAKESFIND OUT MOREA river is a natural channel down which water flows to…

mineral

(Encyclopedia) mineral, inorganic substance occurring in nature, having a characteristic and homogeneous chemical composition, definite physical properties, and, usually, a definite crystalline form…

asbestos, mineral

(Encyclopedia) asbestos, common name for any of a variety of silicate minerals within the amphibole and serpentine groups that are fibrous in structure and more or less resistant to acid and fire.…

Roundup of Recent Science Discoveries, 2000

Ice Age Haute Couture According to recent research by archaeologists at the University of Illinois at Urbana-Champaign, the well-dressed Ice Age woman's outfit doesn't resemble anything like the…

How the Planets and Satellites Got Their Names

Source: The U.S. Geological SurveyMERCURY Named for the winged Roman god of travel because it appears to move so swiftly.VENUS Roman name for the goddess of love. This planet was considered to be…

Moons of the Solar System

by Mark Hughes There are more than 140 known moons throughout our solar system. Most are barren rock, while some have atmospheres, volcanoes, and maybe even oceans of liquid…

Types of Volcanoes

—Robert I. Tilling Source: U.S. Geological Survey Geologists generally group volcanoes into four main kinds—cinder cones, composite volcanoes,…

Tsunami Factfile

The Indian Ocean tsunami that occured in December 2004 was the deadliest in history by Borgna Brunner Before and after satellite images of Banda Aceh, North Sumatra, Indonesia.…