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copper sulfate

(Encyclopedia) copper sulfate, common name for the blue crystalline heptahydrate of cupric sulfate, in which copper has valence +2. It may also refer to cuprous sulfate (Cu2SO4), in which copper has…

Pee Dee

(Encyclopedia) Pee Dee or Great Pee Dee, river, c.435 mi (700 km) long, rising in the Blue Ridge, W N.C., and flowing NE then SE to Winyah Bay, S.C. It is called the Yadkin until it is joined by the…

DK Science: Ice

ICE SHEETSFIND OUT MOREAbout one-tenth of Earth’s dry land and one-eighth of its oceans are covered with ice. This ice is made of snow that collects and becomes compacted (pressed down).…

DK Earth: Earthquakes

WHAT CAUSES EARTHQUAKES? WHAT HAPPENS DURING AN EARTHQUAKE? WHERE DO MOST EARTHQUAKES STRIKE? HOW ARE EARTHQUAKES MEASURED? FIND OUT MOREEarthquakes are vibrations triggered by sudden rock…

Winter Weather Across America

Source: The Federal Emergency Management Agency (FEMA)From the Mid-Atlantic Coast to New England The classic storm in these states is called a Nor'easter. A low-pressure area off the Carolina coast…

Weather: Big-City Snows

Big-City SnowsWeatherBlowing Cold and Hot: The Big OnesWinter Gone SouthBig-City SnowsStorm of the Century?The Greatest One of AllModern Winter of Deep SnowsGalveston Storm SurgeThe Great New England…

Weather: Camille

CamilleWeatherBlowing Cold and Hot: The Big OnesWinter Gone SouthBig-City SnowsStorm of the Century?The Greatest One of AllModern Winter of Deep SnowsGalveston Storm SurgeThe Great New England…

Weather: The Amazing Andrew

The Amazing AndrewWeatherBlowing Cold and Hot: The Big OnesWinter Gone SouthBig-City SnowsStorm of the Century?The Greatest One of AllModern Winter of Deep SnowsGalveston Storm SurgeThe Great New…

Weather: The Great New England Hurricane

The Great New England HurricaneWeatherBlowing Cold and Hot: The Big OnesWinter Gone SouthBig-City SnowsStorm of the Century?The Greatest One of AllModern Winter of Deep SnowsGalveston Storm SurgeThe…

The Olduvai Gorge

The Question: Which canyon, located in Tanzania, is famous for its fossil beds? The Answer: The site you are thinking of is not quite big enough to be…