Science

Definition – Flint is a sedimentary cryptocrystalline form of the mineral quartz, categorized as the variety of chert that occurs in chalk or marly limestone.…

Definition – Breccia (/ˈbrɛtʃiə/ or /ˈbrɛʃiə/) lithified sedimentary rock consisting of angular or subangular fragments larger than 2 millimeters (0.08 inch). It differs from a…

Definition – Gneiss (/ˈnaɪs/) is a globally common type of metamorphic rock that can easily be identified by its alternating layers of minerals known as…

Definition – Caliche (/kəˈliːtʃiː/) is a shallow layer of soil or sediment in which the particles have been cemented together by the precipitation of mineral…

Definition – Obsidian is an igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. It is produced…

Fluorine (symbol F) is a chemical element that is very poisonous. It is the most reactive element on the Periodic Table. Its atomic number (which…

The oxidizing agent can have two meanings. It is a reactant that removes electrons from other reactants during a redox reaction. It means a reactant…

An acidic oxide reacts with water and produces acid. They are also called acid anhydride, which are oxides that react with water to form an…

Definition – Gabbro (/ˈɡæbroʊ/) is a phaneritic (coarse-grained), is an intrusive igneous rock that forms from the result of slow cooling of magma inside of…

Margaritasite is a yellow, cesium-bearing mineral in the carnotite group. Its chemical formula is (Cs, K, H3O)2(UO2)2V2O8·H2O and its crystal system is monoclinic. It was…

Definition – Hornfels is a fine-grained metamorphic rock that was formed by the contact between mudstone/shale, or other clay-rich rock, and a hot igneous body,…

Nitric Acid (HNO3) is a very corrosive and toxic strong acid that can cause severe burns. It is both extremely corrosive and toxic. It is…