Environmental Policy Articles

• Trees
  Forest
  Botany
  Rainforests
  Sustainability
  Exotic Species
   
  

  Growth ring

  Growth rings (or "tree rings" or "annular rings") can be seen in a horizontal cross section cut through the trunk of a tree. Visible rings result from the change in growth speed through the seasons ... > 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
• Weapons Technology
  Nuclear Energy
  Renewable Energy
  Energy and the Environment
  Physics
  Environmental Science
   
  

  Effects of nuclear explosions

  A nuclear explosion occurs as a result of the rapid release of energy from an uncontrolled nuclear reaction. The driving reaction may be nuclear fission, nuclear fusion or a multistage cascading ... > 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
• Oceanography
  Geography
  Global Warming
  Coral Reefs
  Floods
  Geology
   
  

  Geology of the Capitol Reef area

  The exposed geology of the Capitol Reef area presents a record of mostly Mesozoic-aged sedimentation in an area of North America in and around Capitol Reef National Park. Nearly 10,000 feet (3,000 m) ... > more
• Healthy Aging
  Attention Deficit Disorder
  Food Additives
  Sports Science
  Sports Medicine
  Chemistry
   
  

  Chlorine

  Chlorine is the chemical element with atomic number 17 and symbol Cl. It is a halogen, found in the periodic table in group 17. As the chloride ion, which is part of common salt and other compounds, ... > more
• Water
  Oceanography
  Marine Biology
  Ecosystems
  Fish
  Geography
   
  

  Seawater

  Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of approximately 3.5%, or 35 parts per thousand. This means that for every 1 litre (1000 mL) of ... > more
• Nuclear Energy
  Renewable Energy
  Energy and the Environment
  Weapons Technology
  Physics
  Environmental Science
   
  

  Nuclear fission

  Nuclear fission is a process in nuclear physics in which the nucleus of an atom splits into two or more smaller nuclei as fission products, and usually some by-product particles. Hence, fission is a ... > more
• Geography
  Earth Science
  Global Warming
  Volcanoes
  Oceanography
  Severe Weather
   
  

  Bering Strait

  The Bering Strait is a sea strait between Cape Dezhnev, Russia, the easternmost point (169 degrees 43' W) of the Asian continent and Cape Prince of Wales, Alaska, the westernmost point (168 degrees ... > more
• Air Quality
  Environmental Issues
  Ozone Holes
  Energy and the Environment
  Air Pollution
  Global Warming
   

  Refrigerant

  A refrigerant is a compound used in a heat cycle that undergoes a phase change from a gas to a liquid and back. The two main uses of refrigerants are refrigerators/freezers and air conditioners. Cf. ... > more

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