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Expert-reviewed information about the Earth.  For everyone.

    • DNA Featured Article DNA DNA

      Deoxyribonucleic acid (DNA) is a long chain organic molecule that contains the coding for all metabolic and reproductive processes of all living organisms, save for certain... More »

    • Petrochemicals Featured Article Petrochemicals Petrochemicals

      Petrochemicals are chemical products made from the hydrocarbons present in raw natural gas and petroleum crude oil. The largest petrochemical manufacturing industries are to... More »

    • Biomass Featured Article Biomass Biomass

      Biomass is a term in ecology for the  mass of living organisms in a given ecosystem.  Biomass can refer to the living stock of species in a given habitat, but can... More »

    • Dudleya cymosa (Lem.) Britt. & Rose Featured Article Dudleya cymosa (Lem.) Britt. & Rose Dudleya cymosa (Lem.) Britt. & Rose

      Dudleya cymosa (Lem.) Britt. & Rose is a perennial low-growing succulent plant species that is endemic to California. Having a number of subspecies, this fleshy plant is... More »

    • Earth's atmosphere Featured Article Earth's atmosphere Earth's atmosphere

      The Earth's atmosphere is an envelope of gas that surrounds the Earth and extends from the Earth's surface out thousands of kilometres, becoming increasingly thinner (less dense)... More »

    • Virus Featured Article Virus Virus

      A virus is a microscopic organism that can replicate only inside the cells of a host organism. Most viruses are so tiny they are only observable with at least a conventional... More »

    • Herbivore Featured Article Herbivore Herbivore

      Introduction A herbivore is an animal that obtains its energy and nutrients by feeding on plants.  Different types of herbivores eat different plant parts.  For... More »

    • Flora of Napa County, California Featured Article Flora of Napa County, California Flora of Napa County, California

      Napa County is a rural county in northern California encompassing nearly 500,000 acres (200,000 hectares), about 0.5 % of the landmass of the state. It is located 25 miles (40... More »

    • Ecological pyramids Featured Article Ecological pyramids Ecological pyramids

      Ecological pyramids are diagrams that illustrate how ecologically important factors, such as energy, biomass, and population size, vary between trophic levels in an ecosystem.... More »

Recently Updated
Biodiversity Glossary Last Updated on 2013-05-20 at 04:41 Introduction A biodiversity glossary is presented herein, to aid in understanding the many facets of a topic important to scientists, policy makers and the public.... More »
Estimation of adult human biomass Last Updated on 2013-05-20 at 04:30 The energy requirement of species at each trophic level is a function of the number of organisms and their average mass. The study estimates global human biomass, its... More »
Extraterrestrial soils Last Updated on 2013-05-20 at 04:04 Extraterrestrial soils may be defined as any of the solid granular crustal features of planets and moon other than those soils on planet Earth. Despite four decades of space... More »
Eastern Miombo woodlands Last Updated on 2013-05-20 at 03:31 Confined to the lower elevations of the Central African Plateau, the Eastern Miombo woodland ecoregion ranges from southern Tanzania to northern Mozambique and... More »
Northern Africa Last Updated on 2013-05-20 at 03:17     Ecoregions in Northern Africa PA1212    Mediterranean acacia-argania dry woodlands and succulent... More »
Ecoregions of Panama Last Updated on 2013-05-20 at 02:30 The Ecoregions of Panama are shaped by the jagged elongated geometry of the country, its varied terrain within Mesoamerica and its tropical climate. This key land bridge... More »
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