搜尋結果
Excess steam from the drywell enters the wetwell water pool via downcomer pipes. SFP: spent fuel pool area. SCSW: secondary concrete shield wall. The Fukushima nuclear accident was a major nuclear accident at the Fukushima Daiichi nuclear power plant in Ōkuma, Fukushima, Japan which began on March 11, 2011.
- 11 March 2011; 12 years ago
- INES Level 7 (major accident)
- 1 confirmed from radiation (lung cancer, 4 years later), and 2,202 from evacuation.
Mitsubishi F-2. The General Dynamics F-16 Fighting Falcon is an American single-engine supersonic multirole fighter aircraft originally developed by General Dynamics for the United States Air Force (USAF). Designed as an air superiority day fighter, it evolved into a successful all-weather multirole aircraft with over 4,600 built since 1976. [4]
- 20 January 1974; 49 years ago (unplanned), 2 February 1974; 49 years ago (official)
- 1973–2017, 2019–present
- 4,604 (June 2018)
- General Dynamics X-62 VISTA
- Etymology
- Plate Tectonics
- Volcanic Features
- Erupted Material
- Types of Volcanic Eruptions
- Volcanic Activity
- Decade Volcanoes
- Volcanoes and Humans
- Volcanoes on Other Celestial Bodies
- History of Volcano Understanding
The word volcano is derived from the name of Vulcano, a volcanic island in the Aeolian Islands of Italy whose name in turn comes from Vulcan, the god of fire in Roman mythology. The study of volcanoes is called volcanology, sometimes spelled vulcanology.
According to the theory of plate tectonics, Earth's lithosphere, its rigid outer shell, is broken into sixteen larger and several smaller plates. These are in slow motion, due to convection in the underlying ductile mantle, and most volcanic activity on Earth takes place along plate boundaries, where plates are converging (and lithosphere is being ...
A volcano needs a reservoir of molten magma (e.g. a magma chamber), a conduit to allow magma to rise through the crust, and a vent to allow the magma to escape above the surface as lava. The erupted volcanic material (lava and tephra) that is deposited around the vent is known as a volcanic edifice, typically a volcanic cone or mountain. The most c...
The material that is expelled in a volcanic eruptioncan be classified into three types: 1. Volcanic gases, a mixture made mostly of steam, carbon dioxide, and a sulfur compound (either sulfur dioxide, SO2, or hydrogen sulfide, H2S, depending on the temperature) 2. Lava, the name of magma when it emerges and flows over the surface 3. Tephra, particl...
Eruption styles are broadly divided into magmatic, phreatomagmatic, and phreatic eruptions. The intensity of explosive volcanism is expressed using the Volcanic Explosivity Index(VEI), which ranges from 0 for Hawaiian-type eruptions to 8 for supervolcanic eruptions. 1. Magmatic eruptions are driven primarily by gas release due to decompression. Low...
As of December 2022[update], the Smithsonian Institution's Global Volcanism Program database of volcanic eruptions in the Holocene Epoch(the last 11,700 years) lists 9,901 confirmed eruptions from 859 volcanoes. The database also lists 1,113 uncertain eruptions and 168 discredited eruptions for the same time interval. Volcanoes vary greatly in thei...
The Decade Volcanoes are 16 volcanoes identified by the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) as being worthy of particular study in light of their history of large, destructive eruptions and proximity to populated areas. They are named Decade Volcanoes because the project was initiated as part of t...
Volcanic eruptions pose a significant threat to human civilization. However, volcanic activity has also provided humans with important resources.
Earth's Moon has no large volcanoes and no current volcanic activity, although recent evidence suggests it may still possess a partially molten core. However, the Moon does have many volcanic features such as maria (the darker patches seen on the Moon), rilles and domes. The planet Venus has a surface that is 90% basalt, indicating that volcanism p...
Volcanoes are not distributed evenly over Earth's surface but active ones with significant impact were encountered early in human history, evidenced by footprints of hominina found in East Africian volcanic ash dated at 3.66 million years old.: 104 The association of volcanoes with fire and disaster is found in many oral traditions and had religiou...
Guallatiri is a stratovolcano in Chile that is 6,060–6,071 m (19,880–19,918 ft) high. It is located southwest of, or possibly within, the Nevados de Quimsachata volcanic group. The summit, surrounded by numerous fumaroles, may be a lava dome or volcanic plug, while the lower flanks of the volcano are covered by lava flows and lava domes.
The Chernobyl disaster [a] began on 26 April 1986 with the explosion of the No. 4 reactor of the Chernobyl Nuclear Power Plant, near the city of Pripyat in the north of the Ukrainian SSR, close to the border with the Byelorussian SSR, in the Soviet Union. [1] It is one of only two nuclear energy accidents rated at seven—the maximum severity ...
Four presidents died in office of natural causes (William Henry Harrison, Zachary Taylor, Warren G. Harding, and Franklin D. Roosevelt), four were assassinated ( Abraham Lincoln, James A. Garfield, William McKinley, and John F. Kennedy ), and one resigned ( Richard Nixon, facing impeachment and removal from office). [9]
YouTube is an American online video sharing and social media platform owned by Google.Accessible worldwide, it was launched on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim, three former employees of PayPal.Headquartered in San Bruno, California, United States, it is the second most visited website in the world, after Google Search.
