Early Human Articles

• Global Warming
  Oceanography
  El Nino and La Nina
  Climate
  Floods
  Geography
   
  

  Sea level

  Mean sea level (MSL) is the average (mean) height of the sea, with reference to a suitable reference surface. Defining the reference level, however, involves complex measurement, and accurately ... > more
• Dinosaurs
  Paleontology
  Tyrannosaurus Rex
  Fossils
  Early Mammals
  Archaeology
   
  

  Paralititan

  Paralititan stromeri was a giant titanosaurian sauropod dinosaur discovered in coastal deposits in the Upper Cretaceous Bahariya Formation of Egypt. The fossil represents the first tetrapod reported ... > more
• Ancient Civilizations
  Anthropology
  Cultures
  Lost Treasures
  Human Evolution
  Fossils
   
  

  Chichen Itza

  Chichen Itza is a large pre-Columbian archaeological site built by the Maya civilization, located in the northern center of the Yucatán Peninsula, present-day Mexico. From roughly 600 CE in ... > more
• Charles Darwin
  Evolution
  Origin of Life
  Archaeology
  Fossils
  Anthropology
   
  

  Pelycosaur

  The pelycosaurs were smallish to large (up to 3 meters or more) primitive Late Paleozoic synapsid reptiles. They appeared during the Late Carboniferous and reached their acme in the early part of the ... > more
• Fossils
  Origin of Life
  Dinosaurs
  Early Climate
  Paleontology
  Human Evolution
   
  

  Gondwana

  The southern supercontinent Gondwana (originally Gondwanaland) included most of the landmasses which make up today's continents of the southern hemisphere, including Antarctica, South America, ... > more
• Geology
  Earthquakes
  Earth Science
  Natural Disasters
  Near-Earth Object Impacts
  Atmosphere
   
  

  Crust (geology)

  In geology, a crust is the outermost layer of a planet. The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks. The crust is underlain by the mantle. ... > 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
• Extinction
  Nature
  Endangered Plants
  Endangered Animals
  Dinosaurs
  Fossils
   
  

  Permian-Triassic extinction event

  The Permian-Triassic (P-T or PT) extinction event, sometimes informally called the Great Dying, was an extinction event that occurred approximately 251.0 million years ago (mya), forming the boundary ... > more

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