• Tsunamis
  Tsunamis

  Series of ocean waves produced by geologic events or underwater LANDSLIDES. These waves can travel at speeds averaging 450 (and up to 600) miles per hour in the open ocean....<br/>Year introduced: 2010
  MeSH
• Volcanic Eruptions
  Volcanic Eruptions

  The ash, dust, gases, and lava released by volcanic explosion. The gases are volatile matter composed principally of about 90% water vapor, and carbon dioxide, sulfur dioxide,...<br/>Year introduced: 2009 (1995)
  MeSH
• Evolution, Planetary
  Evolution, Planetary

  Creation and development of bodies within solar systems, includes study of early planetary geology.<br/>Year introduced: 1997
  MeSH
• Ice Cover
  Ice Cover

  A thick mass of ICE formed over large regions of land; RIVERS; LAKES; ponds; or SEAWATER.<br/>Year introduced: 2005
  MeSH
• Proximal placement of thumb
  Proximal placement of thumb
  MedGen

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