Sunscreen | Understanding and definition of Sunscreen | The use of sunscreen

Sunblock (also commonly known as sun screen, sun lotion, sun cream or block out) is a lotion, spray, gel or other topical product that abso...

Meteorite | Understanding and definition of Meteorite | Collection of space rock | Fragments of Meteorite | The hunters Meteorite

A meteorite is a natural object originating in outer space that survives impact with the Earth's surface. Meteorites can be big or small...

Gallium | Understanding and definition of Gallium | The function and usefulness of Gallium

Gallium is a chemical element that has the symbol Ga and atomic number 31. Elemental gallium does not occur in nature, but as the gallium(II...

Spiral galaxy | Understanding and definition of Spiral galaxy

A spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, for...

Biotechnology | Understanding and definition of Biotechnology

Biotechnology is a field of applied biology that involves the use of living organisms and bioprocesses in engineering, technology, medicine ...

Chemical formula | History and definition Chemical formula

A chemical formula or molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound....

Plate tectonics | Understanding and definition of Plate tectonics

Plate tectonics (from the Late Latin tectonicus, from the Greek: τεκτονικός "pertaining to building") is a scientific theory which...

Volcanology | The history and description of Volcanology

Volcanology (also spelled vulcanology) is the study of volcanoes, lava, magma, and related geological, geophysical and geochemical phenomena...

Volcano | Understanding and definition Vulcano | The number of the active volcanoes in the world

A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot magma, volcanic ash and gases to escape from below...

Geothermal gradient | Understanding and definitions of Geothermal gradient.

Geothermal gradient is the rate of increasing temperature with respect to increasing depth in the Earth's interior. Away from tectonic p...