Silicon - Valuable Minerals

Neuroanatomy Neuroanatomy is the study of the anatomy and stereotyped organization of nervous systems. In contrast to animals with radial symmetry, whose nervous ...

Silicon is a chemical element with symbol Si and atomic number 14. A hard and brittle crystalline solid with a blue-gray metallic luster, it is a tetravalent metalloid.

The natural environment encompasses all living and non-living things occurring naturally. The term is most often applied to the Earth or some part of Earth.

The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks. The crust is underlain by the mantle. The upper part of the ...

Larch Mountain salamander; Magellanic penguin; Maned wolf; Narwhal; Margay; Montane solitary eagle; Endangered species | Conservation Status