mineral formation
81Paragenesis — is a petrologic concept meaning an equilibrium assemblage of mineral phases . It is used in studies of igneous and metamorphic rock genesis and importantly in studies of the hydrothermal deposition of ore minerals and the rock alteration (vein… …
82Dripstone — may refer to: Hood mould or dripstone, an architectural feature for handling rain water Stalactite, a type of a mineral formation that hangs from the ceiling of a limestone cave Stalagmite, a type of a mineral formation that rises from the floor… …
83Vesicle (biology and chemistry) — Scheme of a simple vesicle (liposome). A vesicle is a bubble of liquid within another liquid, a supramolecular assembly made up of many different molecules. More technically, a vesicle is a small membrane enclosed sack that can store or transport …
84Vesicle (biology) — A vesicle is a small bubble of liquid within a cell. A more formal definition in cell biology, would be that a vesicle is a relatively small, intracellular, membrane enclosed sac that stores or transports substances. Vesicles form naturally… …
85Climate of Mars — Mosaic image of Mars as seen by Viking 1, 22 February 1980 The climate of Mars has been an issue of scientific curiosity for centuries, not least because Mars is the only terrestrial planet whose surface can be directly observed in detail from… …
86Soil chemistry — studies the chemical characteristics of soil. Soil chemistry is affected by mineral composition, organic matter and environmental factors.OverviewUntil the late 1960s, soil chemistry focused primarily on chemical reactions in the soil that… …
87cave — I cave, cavern (New American Roget s College Thesaurus) n. recess, grotto; lair, burrow, den. See concavity, abode. II (Roget s IV) n. Syn. cavern, hollow, rock shelter, grotto; see hole 3 . III (Roget s 3 Superthesaurus) n. cavern, grotto,… …
88potassium-argon dating — noun geological dating that relies on the proportions of radioactive potassium in a rock sample and its decay product, argon • Hypernyms: ↑dating, ↑geological dating * * * /peuh tas ee euhm ahr gon/, Geol. a method for estimating the age of a… …
89Isotopes of lithium — Naturally occurring lithium (Li) (standard atomic mass: 6.941(2) u) is composed of two stable isotopes (SimpleNuclide|Lithium|6 and SimpleNuclide|Lithium|7, the latter being the more abundant (92.5% natural abundance). Seven radioisotopes have… …
90Douglas Maxwell Stone — For other persons of a similar name, see Douglas Stone (disambiguation). Douglas Maxwell Stone also known as Doug Stone (born 26 June 1948) is an Australian geologist, author, publisher, farmer and businessman. He was born in Kew, Victoria, and… …
