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• Fossils
  Paleontology
  Evolution
  Early Mammals
  Dinosaurs
  Charles Darwin
   
  

  Fossil

  Fossils are the mineralized or otherwise preserved remains or traces (such as footprints) of animals, plants, and other organisms. The totality of fossils and their placement in fossiliferous ... > more
• Healthy Aging
  Attention Deficit Disorder
  Hazardous Waste
  Sports Science
  Chemistry
  Sports Medicine
   
  

  Polychlorinated biphenyl

  Polychlorinated biphenyls (PCBs) are a class of organic compounds with 1 to 10 chlorine atoms attached to biphenyl. Although the physical and chemical properties vary widely across the class, PCBs ... > more
• Air Pollution
  Acid Rain
  Geochemistry
  Organic Chemistry
  Air Quality
  Healthy Aging
   

  Nitrogen oxide

  NOx is a generic term for the various nitrogen oxides produced during combustion. They are believed to aggravate asthmatic conditions, react with the oxygen in the air to produce ozone, which is also ... > more
• Fossils
  Paleontology
  Dinosaurs
  Early Climate
  Early Mammals
  Ecology
   
  

  Trace fossil

  Trace fossils are those details preserved in rocks that are indirect evidence of life. While we are most familiar with relatively spectacular fossil hard part remains such as shells and bones, trace ... > more
• 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
• Floods
  Natural Disasters
  Hurricanes and Cyclones
  Severe Weather
  Landslides
  Geography
   
  

  Flood

  A flood is an overflow of water, an expanse of water submerging land, a deluge. Since prehistoric times people have lived by the seas and rivers for the access to cheap and quick transportation and ... > more
• Energy and the Environment
  Petroleum
  Renewable Energy
  Environmental Science
  Oil Spills
  Fossil Fuels
   
  

  Biodiesel

  Biodiesel refers to a diesel-equivalent, processed fuel derived from biological sources. Though derived from biological sources, it is a processed fuel that can be readily used in diesel-engined ... > more
• Soil Types
  Organic
  Recycling and Waste
  Agriculture and Food
  Food
  Hazardous Waste
   
  

  Vermicompost

  Vermicompost (or Worm Compost) the process of using earthworms to breakdown kitchen and garden waste, to create a faster than normal composting. Compared to ordinary soil, the earthworm castings (the ... > more
• Weather
  Severe Weather
  Hurricanes and Cyclones
  Climate
  Global Warming
  Geography
   

  Numerical weather prediction

  Numerical weather prediction is the science of predicting the weather using "models" of the atmosphere and computational techniques. Manipulating the huge datasets and performing the complex ... > more
• Water
  Marine Biology
  Ecosystems
  Floods
  Ecology
  Environmental Issues
   
  

  Estuary

  An estuary is a semi-enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries are often associated with high rates of ... > more

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