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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…

Tikal (/tiˈkɑːl/) (Tik’al in modern Mayan orthography) city and ceremonial centre of the ancient Maya civilization, which was likely to have been called Yax Mutal…

The Partition of Bengal (1905), also well known as ‘Bang-Bhang’ (Bengali: বঙ্গভঙ্গ) was a territorial reorganization of the Bengal Presidency implemented by the authorities of…

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…

The Potala Palace is a dzong fortress, immense religious and administrative complex in Lhasa, southern Tibet Autonomous Region, southwestern China. It was the winter palace…

Central Bank Central bank means a financial system allows one institution to control its money supply and interest rates. It is the number one bank of…

The Colosseum or Coliseum (/ˌkɒləˈsiːəm/ KOL-ə-SEE-əm), also called Flavian Amphitheatre (Latin: Amphitheatrum Flavium; Italian: Anfiteatro Flavio (aɱfiteˈaːtro ˈflaːvjo) or Colosseo (kolosˈsɛːo)), giant amphitheatre built in…

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…