Volcano | Definition, Types, & Facts | Britannica
ウェブ5 日前 · volcano, vent in the crust of Earth or another planet or satellite, from which issue eruptions of molten rock, hot rock fragments, and hot gases. A volcanic eruption is an awesome display of Earth’s power. Yet, while eruptions are spectacular to watch, they can cause disastrous loss of life and property, especially in densely populated ...
Volcano - Wikipedia
ウェブA volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and because most of Earth's plate boundaries are underwater, most volcanoes are ...
Volcanoes - National Geographic Society
ウェブ2023年10月19日 · A volcano is an opening in a planet or moon’s crust through which molten rock, hot gases, and other materials erupt. Volcanoes often form a hill or mountain as layers of rock and ash build up from repeated eruptions. Volcanoes are classified as active, dormant, or extinct. Active volcanoes have a …
Volcano facts and information - National Geographic
ウェブ2018年1月15日 · Volcanoes, explained. These fiery peaks have belched up molten rock, hot ash, and gas since Earth formed billions of years ago. Volcanoes are Earth's geologic architects. They've created more than ...
Global Volcanism Program | Current Eruptions
ウェブ2018年7月7日 · Current Eruptions. Overall, 48 volcanoes were in continuing eruption status as of 19 April 2024. An eruption marked as "continuing" does not always mean persistent daily activity, but indicates at least intermittent eruptive events without a break of 3 months or more. There are typically 40-50 continuing eruptions, and out of …
Volcano facts and types of volcanoes | Live Science
ウェブ2022年3月3日 · Volcano facts and types of volcanoes. A volcano is an opening in Earth's crust where magma breaks through. A volcano on Earth is a vent or fissure in the planet's crust through which lava, ash ...
What Is a Volcano? | NASA Space Place – NASA Science for Kids
ウェブ2024年5月6日 · A volcano is an opening on the surface of a planet or moon that allows material warmer than its surroundings to escape from its interior. When this material escapes, it causes an eruption. An eruption can be explosive, sending material high into the sky. Or it can be calmer, with gentle flows of …
About Volcanoes | U.S. Geological Survey - USGS.gov
ウェブThey are usually tall with steep even sides and are made out of repeating layers of lava flows, volcanic ash, cinders, blocks, and volcanic bombs. Some composite volcanoes rise over 8,000 feet above their surroundings, but they reach much higher elevations when compared to the level of the sea (called above sea level).
What made Guatemala’s Fuego Volcano eruption so deadly?
ウェブ2018年6月4日 · The 12,000-foot “Volcano of Fire” has been erupting on and off since 2002, and Guatemala has a national institute — INSIVUMEH — committed to actively monitoring the country’s volcanoes ...
What is a volcano?
ウェブA volcano is an opening in the earth’s crust through which lava, volcanic ash, and gases escape. Volcanic eruptions are partly driven by pressure from dissolved gas, much as escaping gases force the cork out of a bottle of champagne. Beneath a volcano, liquid magma containing dissolved gases rises through cracks in the Earth’s crust.
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