permafrost ecosystem
51seed bank — /ˈsid bæŋk/ (say seed bangk) noun 1. a store of seeds as a source for their future planting should they become extinct in the natural world. 2. the naturally occurring store of seed conserved in an ecosystem or reserve. There are estimated to be… …
52Soil — For other uses, see Soil (disambiguation). A represents soil; B represents laterite, a regolith; C represents saprolite, a less weathered regolith; the bottommost layer represents bedrock …
53Balance of nature — The Balance of nature refers to the theory that biological systems are usually in a stable equilibrium, which is to say that a small change in some particular parameter (the size of a particular population, for example) will be corrected by some… …
54climate — /kluy mit/, n. 1. the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years. 2. a region or… …
55Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… …
56Geoengineering — Not to be confused with Geotechnical engineering. An oceanic phytoplankton bloom in the South Atlantic Ocean, off the coast of Argentina. Encouraging such blooms with iron fertilization could lock up carbon on the seabed. The modern concept of… …
57Tundra — A Russian word of Finno Ugric origin describing arctic hills, the tundra, which dominated Russia’s Far North, is the world’s northernmost terrestrial biome, abutting the Arctic Ocean coast on both the North American and Eurasian continents.… …
58Global warming controversy — refers to a variety of disputes, significantly more pronounced in the popular media than in the scientific literature,[1][2] regarding the nature, causes, and consequences of global warming. The disputed issues involve the causes of increased… …
59Endolith — lifeform found inside an Antarctic rock An endolith is an organism (archaeum, bacterium, fungus, lichen, alga or amoeba) that lives inside rock, coral, animal shells, or in the pores between mineral grains of a rock. Many are extremophiles,… …
60Changbai Mountains — Chinese name Traditional Chinese 長白山地 Simplified Chinese 长白山地 Literal meaning Perpetually White Mountain Region …
