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Greg Osmond
May 10, 2013 09:05PM

I was watching two Minke whales for one hour today near my home in Woody Point, ...
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May 09, 2013 08:05PM

The Good Force be with you! Well done, Team Curiosity! Keep it up! Live fo...
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amazing !
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Documentation on the Seine barges in the 17th century is scant, but apparently m...

Minerals & Mining

Minerals & Mining

    • Aluminum Featured Article Aluminum Aluminum

      Aluminum is a silver-white metal, very low density (less than three times as dense as water), yet relatively strong. In addition, aluminum is ductile; that is, it can be drawn... More »

    • Calcium Featured Article Calcium Calcium

      Calcium is the chemical element with atomic number 20; it has an atomic mass of 40.078 atomic mass units (amu). The chemical symbol for calcium is Ca. Calcium is a soft gray... More »

    • Health effects of nickel Featured Article Health effects of nickel Health effects of nickel

        Pure nickel is a hard, silvery-white metal, which has properties that make it very desirable for combining with other metals to form mixtures called alloys. Some... More »

    • Nickel Featured Article Nickel Nickel

      Nickel, with a symbol of Ni, is a silvery shiny, metallic element with an atomic number of 28. It can be hammered into thin sheets, which means it is malleable.... More »

    • Limestone Featured Article Limestone Limestone

        Limestone  is a sedimentary rock whose chief mineral component is calcite (calcium carbonate: CaCO3). Limestone can be formed by precipitation of calcite... More »

    • Zinc Featured Article Zinc Zinc

      Previous Element: Copper Next Element: Gallium ... More »

    • Heavy metal Featured Article Heavy metal Heavy metal

      A heavy metal is any one of a number of elements that exhibit metallic properties, which includes transition metals lanthanides actinides as well as the metalloids Arsenic and... More »

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Extraterrestrial soils Last Updated on 2013-05-23 at 18:48 Extraterrestrial soils may be defined as any of the solid granular crustal features of planets and moon other than those soils on planet Earth. Despite four decades of space... More »
Dead Sea Last Updated on 2013-05-13 at 23:29 The Dead Sea is a hypersaline lake that forms part of the border between Jordan from Israel, and that has no outlet and only one principal source, the Jordan River. This is... More »
Cadmium Last Updated on 2013-05-04 at 14:10 Cadmium is a very soft, silvery-white metallic element. Its atomic number is 48, with the atomic symbol Cd. It is so soft that it can be cut with a knife. Cadmium... More »
Orange River Last Updated on 2013-05-02 at 13:22 The Orange River is the longest watercourse in Southern Africa. Lying south of the Zambezi River, The Orange River rises in the Drakensberg Mountains and flows westward to... More »
Vaal River Last Updated on 2013-05-02 at 13:21 The Vaal River rises in the Drakensberg Mountains within the nation of South Africa and is the chief tributary of the Orange River. At 1105 kilometres in length, the Vaal is... More »
Fossil Last Updated on 2013-02-10 at 18:43   A fossil is the preserved remain of a lifeform that lived in prehistoric times. Most commonly fossils are mineralized parts or a whole organism which is no longer... More »
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