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2 天前 · Plate tectonics (from Latin tectonicus, from Ancient Greek τεκτονικός (tektonikós) 'pertaining to building') [1] is the scientific theory that Earth 's lithosphere comprises a number of large tectonic plates, which have been slowly moving since about 3.4 billion years ago. [2] .
1 天前 · The koala ( Phascolarctos cinereus ), sometimes called the koala bear, is an arboreal herbivorous marsupial native to Australia. It is the only extant representative of the family Phascolarctidae and its closest living relatives are the wombats.
2 天前 · Polynesia is characterized by a small amount of land spread over a very large portion of the mid- and southern Pacific Ocean. It comprises approximately 300,000 to 310,000 square kilometres (117,000 to 118,000 sq mi) of land, of which more than 270,000 km 2 (103,000 sq mi) are within New Zealand.
4 天前 · This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: "List of Linux distributions" – news ...
1 天前 · A tornado is a violently rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud.
3 天前 · UNICEF ( / ˈjuːniˌsɛf / YOO-nee-SEF ), originally called the United Nations International Children's Emergency Fund in full, now officially United Nations Children's Fund, [a] is an agency of the United Nations responsible for providing humanitarian and developmental aid to children worldwide.
3 天前 · Philosophy. Philosophy ( φιλοσοφία, 'love of wisdom', in Ancient Greek) is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, value, mind, and language. It is a rational and critical inquiry that reflects on its own methods and assumptions. Historically, many of the individual ...
