Petroleum Articles

• Volcanoes
  Geology
  Sports Science
  Natural Disasters
  Geography
  Nature of Water
   
  

  Igneous rock

  Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive ... > more
• Physics
  Quantum Physics
  Albert Einstein
  Sports Science
  Optics
  Thermodynamics
   
  

  Time in physics

  In physics, the treatment of time is a central issue. In physics, the treatment of time is a central issue. It has been treated as a question of geometry. One can measure time and treat it as a ... > more
• Ultrasound
  Medical Imaging
  Medical Technology
  Pregnancy and Childbirth
  Sports Science
  Detectors
   
  

  Ultrasound

  Ultrasound is sound with a frequency greater than the upper limit of human hearing, approximately 20 kilohertz (20,000 hertz). Some animals, such as dogs, dolphins, bats, and mice have an upper limit ... > more
• Aviation
  Sports Science
  Vehicles
  Construction
  Wind Energy
  Transportation Science
   
  

  Parachute

  A parachute is usually a soft fabric device used to slow the motion of an object through an atmosphere by creating drag. Parachutes are generally used to slow the descent of a person or object to ... > more
• Sports Science
  Vehicles
  Aviation
  Space Probes
  Space Exploration
  Space Station
   
  

  Model rocket

  Model rocketry is a hobby similar to building model airplanes. In the hobby today, there are two distinct areas of rocket activity: amateur (or experimental) rocketry, and model rocketry (including ... > more
• Healthy Aging
  Attention Deficit Disorder
  Sports Science
  Sports Medicine
  Weapons Technology
  Physics
   
  

  Polonium

  Polonium is a chemical element in the periodic table that has the symbol Po and atomic number 84. A rare and highly radioactive metalloid, polonium is chemically similar to tellurium and bismuth, and ... > more
• Biochemistry
  Cell Biology
  Molecular Biology
  Organic Chemistry
  Genetics
  Biotechnology
   
  

  Protein

  Proteins are large organic compounds made of amino acids arranged in a linear chain and joined together between the carboxyl atom of one amino acid and the amine nitrogen of another. This bond is ... > more
• Geology
  Earthquakes
  Natural Disasters
  Sports Science
  Earth Science
  Geography
   
  

  Geologic fault

  Geologic faults or simply faults are planar rock fractures which show evidence of relative movement. Large faults within the Earth's crust are the result of shear motion and active fault zones are ... > more
• Aviation
  Sports Science
  Vehicles
  Energy Policy
  Construction
  Transportation Science
   
  

  Airbus A380

  The Airbus A380 is a double-deck, four-engined airliner manufactured by EADS (Airbus S.A.S.) It first flew on April 27, 2005 from Toulouse in France. Commercial flights are scheduled to begin in 2007 ... > more
• Aviation
  Atmosphere
  Sports Science
  Vehicles
  Global Warming
  Floods
   

  Altitude

  Altitude is the elevation of an object from a known level or datum. Common datums are mean sea level and the surface of the WGS-84 geoid, used by GPS. In the United States and the UK aviation ... > more

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