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• Recycling and Waste
  Hazardous Waste
  Environmental Science
  Environmental Issues
  Earth Science
  Grassland
   

  Activated sludge

  Activated sludge is a process in sewage treatment in which air or oxygen is forced into sewage liquor to develop a biological floc which reduces the organic content of the ... > more
• Hurricanes and Cyclones
  Severe Weather
  Natural Disasters
  Weather
  Oil Spills
  Climate
   
  

  Preparations for Hurricane Katrina

  This article covers the details of the Preparations for Hurricane Katrina, a major category 5 hurricane that devastated parts of Louisiana, Mississippi, and Alabama. By August 26 2005, the ... > more
• Geology
  Fossils
  Earth Science
  Origin of Life
  Early Climate
  Earthquakes
   
  

  Precambrian

  The Precambrian is an informal name for the eons of the geologic timescale that came before the current Phanerozoic eon. It spans from the formation of Earth around 4500 Ma (million years ago) to the ... > more
• Volcanoes
  Natural Disasters
  Climate
  Global Warming
  Environmental Issues
  Floods
   

  Climate changes of 535-536

  In the years 535 and 536, several remarkable aberrations in world climate took place. The Byzantine historian Procopius recorded of 536, "during this year a most dread portent took place. For the sun ... > more
• Storms
  Severe Weather
  Weather
  Environmental Science
  Renewable Energy
  Geomagnetic Storms
   
  

  Thunderstorm

  A thunderstorm, or an electrical storm, is a form of weather characterized by the presence of lightning and its attendant thunder. It is usually accompanied by copious rainfall, hail, or rarely, ... > 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
• Fossils
  Paleontology
  Dinosaurs
  Early Climate
  Early Mammals
  Ecology
   
  

  Trace fossil

  Trace fossils are those details preserved in rocks that are indirect evidence of life. While we are most familiar with relatively spectacular fossil hard part remains such as shells and bones, trace ... > more
• Organic
  Agriculture and Food
  Soil Types
  Geochemistry
  Sustainability
  Environmental Issues
   
  

  Organic gardening

  Organic gardening is a form of gardening that uses substantial diversity in pest control to reduce the use of pesticides and tries to provide as much fertility with local sources of nutrients rather ... > more
• Tsunamis
  Natural Disasters
  Earth Science
  Geomagnetic Storms
  Geology
  Near-Earth Object Impacts
   
  

  Tide

  Tides are the cyclic rising and falling of Earth's ocean surface caused by the tidal forces of the Moon and the Sun acting on the Earth. Tides cause changes in the depth of the sea, and also produce ... > more
• Tornadoes
  Severe Weather
  Climate
  Hurricanes and Cyclones
  Natural Disasters
  Storms
   
  

  Iowa Tornado Outbreak of November 2005

  The Iowa Tornado Outbreak of November 2005 was a large and exceptionally rare late autumn season tornado outbreak on the afternoon and evening of November 12, 2005 all throughout the state but ... > more

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