May 2021 - Page 2 of 3

List of main volcanoes in the world

May 25, 2021November 8, 2022 pcsclasses

List of main volcanoes in the world (For UPSC and other exams) Volcanos are landforms created by the accumulation of solidified lava and volcanic detritus from the earth’s crust. The list of main volcanos in the world and their features are given in the table. (for details about volcanoes- Must read → Volcanoes, definition, types, and facts) List of Main Active Volcanoes in the world: The list of main active volcanoes in the world with their location and latest activity is given below in the table: List of Active Volcano…

Volcanoes: Definition, Types, & Facts

May 25, 2021July 20, 2023 pcsclasses

Volcanoes: Definition, Types, & Facts Volcanoes referred to landforms created by the accumulation of solidified lava and volcanic detritus near the vent. In simple words, a volcano is a rupture in the crust of a planetary-mass object, like Earth, by which hot lava, gases, and volcanic ash escape from the magma chamber below the surface. Volcanoes are most often found on Earth at the place where tectonic plates are diverging or converging. The most concentration of volcanoes is found underwater. Magma In the deep of the earth, it is too…

Continental Drift Theory

May 23, 2021July 20, 2023 pcsclasses

Continental Drift Theory Continental Drift Theory: Abraham Ortelius first put forward the speculation that the continent might have ‘drifted’ in 1596. The first comprehensive and fully developed Continental Drift Theory was proposed by a German meteorologist, Alfred Wegener in 1912. Alfred Wegener was the first person who used the phrase ‘continental drift’. According to his hypothesis, all the continents were once been joined into a single landmass, called Pangaea, and a Mega Ocean surrounded this supercontinent. The name of the Mega Ocean was ‘Panthalassa’, before breaking apart and drifting to…

Sedimentary Rocks – Types and characteristics

May 21, 2021March 28, 2023 pcsclasses

Sedimentary rocks Sedimentary rocks are a type of rock formed by the accumulation or deposition of organic particles or minerals and their consolidation at the earth’s surface. The whole process of formation of these rocks is called sedimentation. Types of Sedimentary Rocks These rocks are of the following types: Argillaceous (Aqueous Rocks) Aeolian rocks Glacial rocks. Argillaceous (Aqueous Rocks): These are a group of rocks formed by detritus. these are detrital rocks made of mudstones, siltstones, etc. Types of Argillaceous rocks: Marine: These rocks are formed due to the deposition…

The Rocks- Igneous Rocks

May 21, 2021August 21, 2022 pcsclasses

The Rocks- Igneous Rocks: Introduction: Rocks are naturally occurring solid masses. These are aggregates of minerals like feldspars, micas, amphiboles, pyroxenes, olivine, quartz, calcite, dolomite, clays, and gypsum. Some rocks also contain mineraloids, which are rigid, mineral-like substances, like volcanic glass, lacking crystalline structure. Rocks form the outer solid layer, the crus, and most of its interior, except the liquid core of the earth. Petrology: The scientific study of the character and origin of rocks is called petrology, under geology. On the basis of origin and mode of formation, rocks…

The Viruses- Classification, Structure and Diseases

May 17, 2021September 24, 2023 pcsclasses

The Viruses- Classification, Structure, and Diseases Viruses are sub-microscopic, acellular, and non-cytoplasmic infectious agents. These replicates are only in the living cell of an organism. Viruses can infect every type of life form like animals, plants, microorganisms like bacteria, etc. and these are transmissible from diseased to healthy organisms. Dmitri Ivanvosky discovered the virus (1892) in an extract of a tobacco plant that was infected with the Tobacco mosaic virus (TMV). The study of Viruses is known as virology (under microbiology) The term virus was coined by Pasteur (Latin Virus-…

Mucormycosis or Black Fungus in COVID-19

May 16, 2021 pcsclasses

Mucormycosis or Black Fungus in COVID-19 Why it is in news? Black fungus or Mucormycosis infection has detected in a few COVID-19 Positive patients in various states, Delhi, Maharashtra, and Gujarat in INDIA. One of the known case COVID-19 positive and get infected with Black Fungus is as below : Dr. Akshay Nair, a Mumbai-based eye surgeon, was waiting to operate on a 25-year-old woman who had recovered from a bout of Covid-19. Inside the surgery, an ear, nose, and throat specialist was already at work on the patient, a…

Floral Diagram and formula

May 15, 2021December 28, 2023 pcsclasses

Floral Diagram and Formula Floral Diagram: The diagram that illustrates the relative position and number of parts present in each whorl in a flower is termed the floral diagram. It provides information about the number of parts of a flower, their arrangement, and the relation they share. The diagram is mostly drawn based on the position of the mother axis concerning the flower which is represented as a dot on the top of the floral diagram. The calyx, corolla, androecium, and gynoecium to drawn in successive whorls, as the calyx…