El Nino and La Nina Articles

• Caving
  Acid Rain
  Geography
  Geology
  Oceanography
  Water
   
  

  Limestone

  Limestone is a sedimentary rock composed largely of the mineral calcite (calcium carbonate: CaCO3). Limestones often contain variable amounts of silica in the form of chert or flint, as well as ... > more
• Ecology
  Ecology Research
  Nature
  Ecosystems
  Environmental Issues
  Biology
   
  

  Ecology

  Ecology, or ecological science, is the scientific study of the distribution and abundance of living organisms and how the distribution and abundance are affected by interactions between the organisms ... > more
• Hurricanes and Cyclones
  Severe Weather
  Storms
  Weather
  Geography
  Ecosystems
   
  

  Hurricane Charley

  Hurricane Charley was the third named storm, the second hurricane, and the second major hurricane of the 2004 Atlantic hurricane ... > more
• Desert
  Geography
  Water
  Environmental Issues
  Pollution
  Drought Research
   
  

  Desert

  In geography, a desert is a landscape form or region that receives very little precipitation. Generally deserts are defined as areas that receive an average annual precipitation of less than 250 mm ... > more
• Nature
  Oceanography
  Ecology
  Marine Biology
  Earth Science
  Global Warming
   

  Ocean acidification

  Ocean acidification is the name given to the ongoing decrease in the pH of the Earth's oceans, caused by their uptake of anthropogenic carbon dioxide from the atmosphere. Between 1751 and 2004 ... > more
• Earthquakes
  Natural Disasters
  Tsunamis
  Construction
  Sports Science
  Physics
   

  Richter magnitude scale

  The Richter magnitude test scale (or more correctly local magnitude ML scale) assigns a single number to quantify the size of an earthquake. It is a base-10 logarithmic scale obtained by calculating ... > 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
• Hurricanes and Cyclones
  Severe Weather
  Storms
  Geography
  Weather
  Tornadoes
   
  

  Hurricane Isabel

  Hurricane Isabel was the ninth named storm, the fifth hurricane, the second major hurricane, and the only Category 5 hurricane of the 2003 Atlantic hurricane ... > more
• Water
  Drought Research
  Ecosystems
  Environmental Issues
  Pollution
  Sustainability
   
  

  Water resources

  Water resources are sources of water that are useful or potentially useful to humans. It is important because it is needed for life to exist. Many uses of water include agricultural, industrial, ... > more
• Volcanoes
  Natural Disasters
  Near-Earth Object Impacts
  Geology
  Exotic Species
  Caving
   
  

  Volcanic cone

  Volcanic cones are among the simplest volcano formations. They are built by fragments (called ejecta) thrown up (ejected) from a volcanic vent, piling up around the vent in the shape of a cone with a ... > more

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