El Nino and La Nina Articles

• Extinction
  Dinosaurs
  Endangered Animals
  Endangered Plants
  Fossils
  Early Climate
   
  

  Extinction event

  An extinction event (also extinction-level event, ELE) occurs when a large number of species die out in a relatively short period of time. Since life began on Earth, a number of major mass ... > more
• Hurricanes and Cyclones
  Severe Weather
  Weather
  Natural Disasters
  Storms
  Oil Spills
   
  

  Meteorological history of Hurricane Katrina

  The meteorological history of Hurricane Katrina, an extremely destructive hurricane which was Category 5 at its peak, starts from its formation over the southeastern Bahamas as Tropical Depression ... > more
• Weather
  Climate
  Global Warming
  Environmental Issues
  Severe Weather
  Earth Science
   

  Climate model

  Climate models use quantitative methods to simulate the interactions of the atmosphere, oceans, land surface, and ice. They are used for a variety of purposes from study of the dynamics of the ... > more
• Water
  Recycling and Waste
  Drought
  Environmental Issues
  Drought Research
  Ecosystems
   
  

  Groundwater

  Groundwater is water located beneath the ground surface in soil pore spaces and in the fractures of geologic formations. A formation of rock/soil is called an aquifer when it can yield a useable ... > more
• Pollution
  Air Quality
  Air Pollution
  Environmental Issues
  Environmental Science
  Water
   
  

  Humidity

  Humidity is the concentration of water vapor in the air. The concentration can be expressed as absolute humidity, specific humidity, or relative humidity. Relative humidity is the most frequently ... > more
• Volcanoes
  Natural Disasters
  Sports Science
  Geology
  Global Warming
  Early Climate
   
  

  Volcano

  A volcano is an opening (or rupture) in the Earth's surface or crust, which allows hot, molten rock, ash, and gases to escape from deep below the surface. Volcanic activity involving the extrusion of ... > 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
• Hurricanes and Cyclones
  Severe Weather
  Storms
  Weather
  Rainforests
  Earth Science
   
  

  Tropical cyclone

  A tropical cyclone (also referred to as a tropical depression, tropical storm, typhoon, or hurricane depending on strength and geographical context) is a type of low pressure system which generally ... > more
• Global Warming
  Climate
  Environmental Issues
  Early Climate
  Nature
  Environmental Policy
   
  

  Global warming

  Global warming refers to the increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation. The global average air temperature ... > more
• Global Warming
  Ice Ages
  Climate
  Geography
  Oceanography
  Snow and Avalanches
   
  

  Antarctic ice sheet

  The Antarctic ice sheet is the largest single mass of ice on Earth. It covers an area of almost 14 million square km and contains 30 million cubic km of ice. Around 90 percent of the fresh water on ... > more

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