Science / Geology / Diatom: A one celled plant that lives in the shallow waters of lakes, streams or oceans. Many of these secrete a shell or internal parts composed of silica. Diatoms can occur in very large numbers and can make significant contributions to sea-floor or lake sediment.

Spring Diatom Increase

Science / Marine Biology / Spring Diatom Increase: The major rapid population increase of diatoms, occurring in the spring in temperate-boreal latitudes MORE

Diatomaceous Earth

Science / Biology / Diatomaceous Earth: Fossilized deposits of diatoms; used for abrasives, polishes and as a filtering agent. MORE

Diatom Ooze

Science / Geology / Diatom Ooze: A seafloor sediment that consists of at least 30% diatom remains. MORE


Science / Geology / Diatomite: A light colored, fine-grained siliceous sedimentary rock that forms from a sediment rich in diatom remains. MORE

Diatomic Molecule

Science / Chemistry / Diatomic Molecule: A molecule that contains only two atoms. All of the noninert gases occur as diatomic molecules; e. G. Hydrogen, oxygen, nitrogen, fluorine, and chlorine are H2, O2, N2, F2, and Cl2, respectively. MORE

Nitrogen (N)

Science / Periodic Table of Elements / Nitrogen (N): Atomic number: 7, Atomic mass: 14.0067 g.mol -1, Electronegativity: 3.0, Density: 1.25*10-3 g.cm-3 at 20°C, Melting point: -210 °C, Boiling point: -195.8 °C, Vanderwaals radius: 0.092 nm, Ionic rad MORE