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Results 1 - 2 of 2 for Infrastructure
  1. Air Pollution (National Library of Medicine)  
    Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended ...
    https://medlineplus.gov/airpollution.html - Health Topics
  2. 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