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arsenic

(Encyclopedia) arsenicarsenicärˈsənĭk [key], a semimetallic chemical element; symbol As; at. no. 33; at. wt. 74.92160; m.p. 817℃ (at 28 atmospheres pressure); sublimation point 613℃; sp. gr. (stable…

gasoline

(Encyclopedia) gasoline or petrol, light, volatile mixture of hydrocarbons for use in the internal-combustion engine and as an organic solvent, obtained primarily by fractional distillation and “…

Whittier, John Greenleaf

(Encyclopedia) Whittier, John GreenleafWhittier, John Greenleafhwĭtˈēər [key], 1807–92, American Quaker poet and reformer, b. near Haverhill, Mass. Whittier was a pioneer in regional literature as…

carbon monoxide

(Encyclopedia) carbon monoxide, chemical compound, CO, a colorless, odorless, tasteless, extremely poisonous gas that is less dense than air under ordinary conditions. It is very slightly soluble in…

Menacing Monster Guide

Fact Monster'sMenacing Monster Guide by David Johnson Goblins From their birthplace in France, these nasty, hideous cousins of gnomes have spread all over Europe. When they…

DK Earth: Atmosphere

DOES THE ATMOSPHERE REMAIN THE SAME FROM EARTH TO SPACE? WHAT IS ATMOSPHERIC PRESSURE? FIVE ATMOSPHERE LAYERSOZONE LAYERFIND OUT MOREMost life on Earth depends on the atmosphere, a bubble of gases…

DK Science & Technology: Changing Materials

HOW DO CHEMICAL REACTIONS CHANGE MATERIALS? RUSTING IRON WHAT MAKES GLUE STICK? HOW DOES HEAT CHANGE MATERIALS? REVERSIBLE CHANGESPERMANENT CHANGESFIND OUT MOREWe can use chemical reactions and…

DK Science: Medical Technology

HI-TECH IMAGING SURGERY ARTIFICIAL DEVICES FIND OUT MORE Technology plays an increasingly important role in modern medicine. Today, HI-TECH IMAGING allows doctors to view internal body…

DK Science: Recycling

LANDFILL SITESROLLING STEELSHEET STEELRECYCLING PAPERRECYCLED PLASTICBIODEGRADABLEFIND OUT MOREMany things we normally throw away can be recycled (used again), including paper, glass, metals,…