Tundra Articles

• Global Warming
  Nature of Water
  Ice Ages
  Climate
  Oceanography
  Snow and Avalanches
   
  

  Ice shelf

  An ice shelf is a thick, floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface, typically in Antarctica or Greenland. The boundary ... > more
• Zoology
  Rodents
  Animals
  Exotic Species
  Earth Science
  Mammals
   
  

  Lemming

  Lemmings are small rodents, usually found in or near the Arctic. Together with the voles and muskrats, they make up the subfamily Arvicolinae (also known as Microtinae), which forms part of the ... > more
• Global Warming
  Early Climate
  Climate
  Ice Ages
  Fossils
  Environmental Issues
   
  

  Geologic temperature record

  This article is devoted to temperature changes in Earth's environment as determined from geologic evidence on multi-million to billion (109) year time scales. The last 3 million years have been ... > more
• Oceanography
  Geography
  Global Warming
  Ecosystems
  Water
  Earth Science
   
  

  Ocean current

  An ocean current is any more or less permanent or continuous, directed movement of ocean water that flows in one of the Earth's oceans. The currents are generated from the forces acting upon the ... > more
• Geography
  Earth Science
  Ozone Holes
  Global Warming
  Forest
  Rainforests
   
  

  Tropic of Cancer

  The Tropic of Cancer, or Northern tropic is one of the five major circles of latitude that mark maps of the Earth. It is the parallel of latitude that lies currently 23 degrees 26′ 22″ ... > more
• Birds
  Early Birds
  Bird Flu Research
  Zoology
  New Species
  Animals
   
  

  Bird

  Birds are bipedal, warm-blooded, oviparous vertebrates characterized primarily by feathers, forelimbs modified as wings, and hollow bones. Birds range in size from the tiny hummingbirds to the huge ... > more
• Weather
  Severe Weather
  Rainforests
  Geography
  Hurricanes and Cyclones
  Acid Rain
   

  Raining animals

  Raining animals is a relatively common meteorological phenomenon, with occurrences reported from many countries throughout history. The animals most likely to drop from the sky in a rainfall are fish ... > more
• Global Warming
  Climate
  Environmental Issues
  Nature
  Geography
  Environmental Policy
   
  

  Effects of global warming

  The predicted effects of global warming are many and various, both for the environment and for human life. There is some speculation that global warming could, via a shutdown or slowdown of the ... > more
• Atmosphere
  Ozone Holes
  Air Quality
  Renewable Energy
  Environmental Science
  Geomagnetic Storms
   

  Planetary boundary layer

  The planetary boundary layer (PBL) is also known as the atmospheric boundary layer (ABL). It is the lowest part of the atmosphere and its behavior is directly influenced by its contact with the ... > more
• Hurricanes and Cyclones
  Severe Weather
  Earth Science
  Climate
  Geomagnetic Storms
  Weather
   
  

  Season

  A season is one of the major divisions of the year, generally based on yearly periodic changes in weather. In temperate and polar regions generally four seasons are recognized: spring, summer, ... > more

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