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Results 1 - 2 of 2 for natural gas
  1. Volcanoes (National Library of Medicine)  
    A volcano is a vent in the Earth's crust. Hot rock, steam, poisonous gases, and ash reach the Earth's surface when a volcano erupts. An eruption can also ...
    https://medlineplus.gov/volcanoes.html - Health Topics
  2. Climate Change (National Library of Medicine)  
    ... for many years. It can be caused by natural factors or by human activities. Today climate changes ...
    https://medlineplus.gov/climatechange.html - Health Topics