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• Geography
  Earth Science
  Earthquakes
  Geology
  Near-Earth Object Impacts
  Geomagnetic Storms
   
  

  Circle of latitude

  On the Earth, a circle of latitude or parallel is an imaginary east-west circle that connects all locations with a given latitude. The position on the circle of latitude is given by the longitude. ... > more
• Air Quality
  Air Pollution
  Pollution
  Environmental Science
  Environmental Issues
  Acid Rain
   
  

  Air pollution

  Air pollution is a broad term applied to any chemical, physical (particulate matter), or biological agent that modifies the natural characteristics of the atmosphere. The atmosphere is a complex, ... > more
• Exotic Species
  Nature
  Ecology
  Invasive Species
  Ecology Research
  New Species
   
  

  Invasive species

  Invasive species is a phrase with several definitions. The first definition expresses the phrase in terms of non-indigenous species (e.g. plants or animals) that adversely effect the habitats they ... > more
• Fish
  Marine Biology
  Fisheries
  Sea Life
  Geography
  Wild Animals
   
  

  Seahorse

  Hippocampus is a genus of fish known as Seahorses (family Syngnathidae). Seahorses range in size from 16 mm (the recently discovered Hippocampus denise) to 35 cm. They are notable for being one of ... > 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
• Fisheries
  Fish
  Invasive Species
  Exotic Species
  Geography
  Zoology
   
  

  Lamprey

  A lamprey is a jawless fish with a toothed, funnel-like sucking mouth, with which most species bore into the flesh of other fishes to suck their blood. Lampreys live mostly in coastal and fresh ... > more
• Healthy Aging
  Attention Deficit Disorder
  Sports Medicine
  New Species
  Pests and Parasites
  Pregnancy and Childbirth
   
  

  Nematode

  The roundworms or nematodes are one of the most common phyla of animals. They are ubiquitous in freshwater, marine, and terrestrial environments. Further, there are a great many parasitic forms, ... > more
• Soil Types
  Organic
  Exotic Species
  Invasive Species
  Agriculture and Food
  Geography
   
  

  Earthworm

  Earthworm is the common name for the larger members of the Oligochaeta (which is either a class or subclass depending on the author) in the phylum Annelida. Earthworms travel underground by the means ... > more
• Fisheries
  Mating and Breeding
  Fish
  Animals
  Invasive Species
  Wild Animals
   
  

  Horseshoe crab

  The horseshoe crab (Limulus polyphemus) is an arthropod that is more closely related to spiders than crabs. Horseshoe crabs possess the rare ability to regrow limbs lost. Limulus has been extensively ... > more
• Volcanoes
  Natural Disasters
  Fossils
  Origin of Life
  Earthquakes
  Earth Science
   

  Supervolcano

  A supervolcano refers to a volcano that produces the largest and most voluminous kinds of eruption on Earth. The actual explosivity of these eruptions varies, but the sheer volume of extruded magma ... > more

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