primary productivity
51Carbon cycle — The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.The cycle is usually thought of as four major reservoirs of carbon interconnected by… …
52Coral reef — Marine habitats Biodiversity of a coral reef Lit …
53Gaia hypothesis — The study of planetary habitability is partly based upon extrapolation from knowledge of the Earth s conditions, as the Earth is the only planet currently known to harbour life. The Gaia hypothesis, also known as Gaia theory or Gaia principle,… …
54Howard T. Odum — Infobox Systems scientist region = Systems Ecology era = 20th century color = #B0C4DE image caption = name = Howard Thomas Odum birth = 1 September 1924 Chapel Hill, North Carolina, USA death = 11 September 2002 Gainesville, Florida, USA school… …
55Ocean fisheries — A fishery is an area with an associated fish or aquatic population which is harvested for its commercial value. Fisheries can be wild or farmed. Most of the world s wild fisheries are in the ocean. This article is an overview of ocean fisheries.… …
56Sonoma Creek — Geobox|River name = Sonoma Creek native name = other name = category = stream etymology = nickname = image caption = Waterfall at Sugarloaf Mountain headwaters of Sonoma Creek country = United States state = California region = Sonoma and Napa… …
57Climate change — For current and future climatological effects of human influences, see global warming. For the study of past climate change, see paleoclimatology. For temperatures on the longest time scales, see geologic temperature record …
58Energy — This article is about the scalar physical quantity. For other uses, see Energy (disambiguation). Energetic redirects here. For other uses, see Energetic (disambiguation) …
59Wild fisheries — A fishery is an area with an associated fish or aquatic population which is harvested for its commercial value. Fisheries can be marine (saltwater) or freshwater. They can also be wild or farmed. This article is an overview of the habitats… …
60undersea exploration — Introduction the investigation and description of the ocean waters and the seafloor and of the Earth beneath. Primary objectives and accomplishments Included in the scope of undersea exploration are the physical and chemical… …
