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Expert-reviewed information about the Earth.  For everyone.

 

 

  • Aquifer Featured Article Aquifer Aquifer

    Introduction An aquifer is a geologic formation, group of formations, or part of a formation that contains sufficient saturated permeable material to yield significant... More »

  • Welwitschia Featured Article Welwitschia Welwitschia

    The Welwitschia (Welwitschia mirabilis) is a gymnosperm relict plant endemic to the Namib Desert. The species aerial architecture consists of a pair of very wide curled and... More »

  • Frugivore Featured Article Frugivore Frugivore

    A frugivore is a type of herbivore (plant-eating animal) that eats a substantial portion of fruit.  A few frugivores species eat only fruit, but many also consume leaves... More »

  • Marine microbes Featured Article Marine microbes Marine microbes

    The term 'Marine microbes' encompasses all microscopic organisms generally found in saltwater. Most micro-organisms are acellular and fall into the major categories of... More »

  • Dugong Featured Article Dugong Dugong

    The Dugong, often referred to as the sea cow, is actually more closely related to elephants than to the bovine namesake.  Throughout much of their range, the Dugong has... More »

  • Healthy Community Design Featured Article Healthy Community Design Healthy Community Design

    The way we design and build our communities can affect our physical and mental health. Healthy community design integrates evidence-based health strategies into community... More »

  • Carpenter bee Featured Article Carpenter bee Carpenter bee

    This hexapod (six-legged) insect is a bee in the subfamily Xylocoinae of either the genus Ceratina or Xylocopa that makes its nest in wood or plant stems. Along... More »

  • Endangered species Featured Article Endangered species Endangered species

    An endangered species is a biological taxon that is at risk of becoming extinct in a proximate time frame much sooner than the long term horizon in which species typically... More »

  • Composting tips Featured Article Composting tips Composting tips

    Composting turns household wastes into valuable fertilizer and soil organic matter. All organic matter eventually decomposes. Composting speeds the process by providing an... More »

Recently Updated
Brassicaceae: An agri-horticulturally important family Last Updated on 2014-07-22 17:19:27 Brassicaceae (Cruciferae) is an important dicotyledonous, angiospermic (true flowering) plant family with a global distribution. Species belonging to the Brassicaceae are well suited to a wide range of intensive and low input agri-techniques. They are primarily adapted to temperate and sub-tropical climates depending on the species. Brassica species play an important role in global agriculture and horticulture. The genus Brassica was described by Linneus in 1750 based on B. oleracea.  Brassica contains a number of important species and wide genetic diversity. The species are characterized by a wide range of adaptations that have been domesticated into crops including oilseed rape/canola and swede (Brassica napus L.); cabbage, cauliflower; broccoli, brussels sprout (B. oleracea L.); turnip, Chinese cabbage and pak choi (B. rapa L.) and mustards (B. nigra (L.) W.D.J. Koch, B. alba... More »
Food Biodiversity Challenges From a Global Perspective Last Updated on 2014-07-22 14:55:32 Food collection or gathering has been an important part of human endeavors towards establishing civilization across the long history of human evolution. Humans have demonstrated their ingenuity in identifying and locating new and novel food sources located in their immediate surrounding and during their migration across the planet. Humans have become more successful than other species because of their better foraging abilities and coordinated group work in identifying and locating novel food sources over time. This trial and error approach has enabled humans over time to identify suitable food sources from their local environments. Over time, humans have identified more species that are edible or could be made edible using primitive to modern day recipes and cooking techniques. These long years of trial and errors have generated a wide range of food sources for... More »
Sri Lanka Last Updated on 2014-07-21 17:07:59 Sri Lanka (formerly known as Ceylon) is an island nation of over twenty-one million people in the Indian Ocean, about 28 kilometers (18 mi.) off the southeastern coast of India. Its major environmental issues include: deforestation; soil erosion;     wildlife populations threatened by poaching and urbanization; coastal degradation from mining activities and increased pollution; freshwater resources being polluted by industrial wastes and sewage runoff; waste disposal; and, air pollution in Colombo Sri Lanka is susceptible to occasional cyclones and tornadoes. The first Sinhalese arrived in Sri Lanka late in the 6th century B.C., probably from northern India. Buddhism was introduced in about the mid-third century B.C., and a great civilization developed at the cities of Anuradhapura (kingdom from... More »
Pinniped Last Updated on 2014-07-21 17:04:25 Pinnipeds ("finned-feet") are are group of marine mammals, that includes seals, sea lions, and walruses. The word pinniped is sometimes treated as a synonym for "seal" since all pinnipeds except for the the sole species of Walrus are seals (sea lions are eared seals).     Scientific Classification Kingdom: Animalia (Animals) Phylum:--- Chordata Class:------ Mammalia (Mammals) Order:-------- Carnivora (Carnivores) Family:-------- Otariidae (Eared seals) Pinnipeds differ form other marine mammals like whales, dolphins and porpoises in that they do not spend their entire lives in water. Pinnipeds "haul out" onto land and ice to mate, give birth, moult, and rest. Pinnipeds were agressively hunted until the early twentieth century for their skins, oil, meat and, in the case of... More »
Ecosystem services fact sheet Last Updated on 2014-07-09 17:01:53 This ecosystems services fact sheet is intended to provide an overview of the subject of ecosystem services, e.g. the economic consequences to humankind of benefits provided by the natural environment. This fact sheet was originally developed by the Ecological Society of America (ESA). Have you ever considered that the cereal you eat is brought to you each morning by the wind, or that the glass of clear, cold, clean water drawn from you faucet may have been purified for you by a wetland or perhaps the root system of an entire forest? Trees in your front yard work to trap dust, dirt, and harmful gases from the air you breathe. The bright fire of oak logs you light to keep warm on cold nights and the medicine you take to ease the pain of an ailment come to you from Nature’s warehouse of services. Natural ecosystems perform fundamental life-support services upon which human... More »