Convoy PQ 16 - Wikipedia
1 天前 · Russian map showing Arctic convoy routes from Britain and Iceland, past Norway to the Barents Sea and northern Russian ports After Operation Barbarossa , the German invasion of the USSR , began on 22 June 1941, the UK and USSR signed an agreement in July that they would "render each other assistance and support of all kinds in the present war ...
List of impact structures on Earth - Wikipedia
1 天前 · Less than ten thousand years old, and with a diameter of 100 m (330 ft) or more. The EID lists fewer than ten such craters, and the largest in the last 100,000 years (100 ka) is the 4.5 km (2.8 mi) Rio Cuarto crater in Argentina. [2] However, there is some uncertainty regarding its origins [3] and age, with some sources giving it as < 10 ka [2] [4] while the EID gives a broader …
List of Antarctic and subantarctic islands - Wikipedia
1 天前 · This is a list of Antarctic and sub-Antarctic islands.. Antarctic islands are, in the strict sense, the islands around mainland Antarctica, situated on the Antarctic Plate, and south of the Antarctic Convergence.According to the terms of the Antarctic Treaty, claims to sovereignty over lands south of 60° S are not asserted. [1]Sub-Antarctic islands are the islands situated closer …
Paracel Islands - Wikipedia
1 天前 · The Paracel Islands, also known as the Xisha Islands (simplified Chinese: 西沙群岛; traditional Chinese: 西沙群島; pinyin: xīshā qúndǎo; lit. 'West Sand Archipelago') [2] and the Hoàng Sa Archipelago (Vietnamese: Quần đảo Hoàng Sa, lit. 'Yellow Sand Archipelago'), are a disputed archipelago in the South China Sea under de facto administration by the People's …
Jurassic - Wikipedia
1 天前 · The Jurassic (/ dʒ ʊ ˈ r æ s ɪ k / juurr-ASS-ik [2]) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period 201.4 million years ago (Mya) to the beginning of the Cretaceous Period, approximately 145 Mya. The Jurassic constitutes the middle period of the Mesozoic Era as well as the eighth period of the Phanerozoic Eon and is named …
Nuclear decommissioning - Wikipedia
1 天前 · Nuclear decommissioning is the administrative and technical process leading to the irreversible closure of a nuclear facility such as a nuclear power plant (NPP), a research reactor, an isotope production plant, a particle accelerator, or uranium mine.It refers to the administrative and technical actions taken to remove all or some of the regulatory controls from the facility to …