permafrost ecosystem
21Lake — For other uses, see Lake (disambiguation). Oeschinen Lake in the Swiss Alps A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the… …
22Biosphäre — Die Biosphäre reicht hinauf bis in den unteren Rand der Mesosphäre. Die Biosphäre [bioˈsfɛːrə] (von griechisch βίος bíos ‚Leben‘ und σφαίρα sfaira ‚Kugel‘) bezeichnet den Raum mit Leben eines Himmelskörpers. Es ist derjenige Raum, in dem Leben… …
23Arctic — For the ships, see MV Arctic, SS Arctic, USS Arctic. For other uses, see Arctic (disambiguation) Location of the Arctic …
24Quaternary extinction event — Late Pleistocene landscape of northern Eurasia The Quaternary period saw the extinctions of numerous predominantly larger, especially megafaunal, species, many of which occurred during the transition from the Pleistocene to the Holocene epoch.… …
25Sea level rise — is an increase in sea level. Multiple complex factors may influence this change. Sea level has risen about 130 meters (400 ft) since the peak of the last ice age about 18,000 years ago. Most of the rise occurred before 6,000 years ago. From 3,000 …
26Mauna Kea — with its seasonal snow cap visible Elevation 4,205 m (13,796  …
27Qinghai–Tibet Railway — Map of the railway A train pulled by an …
29Polar ecology — is the relationship between plants and animals in a polar environment. Polar environments are in the Arctic and Antarctic regions. Arctic regions are in the northern hemisphere, and it contains land and the islands that surround it. Antarctic is… …
30Polar bear — This article is about the animal. For other uses, see Polar bear (disambiguation) …
