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...
Extraterrestrial soilsLast 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 SeaLast 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 »
CadmiumLast 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 RiverLast 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 RiverLast 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 »
FossilLast 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 »