Volcano | Definition, Types, & Facts | Britannica
2024年11月12日 · 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. The term volcano can also refer to the landform created by the accumulation of …
Volcanology | Eruptions, Magma, Lava | Britannica
Volcanology deals with the formation, distribution, and classification of volcanoes as well as with their structure and the kinds of materials ejected during an eruption (such as pyroclastic flows, lava, dust, ash, and volcanic gases).
Volcano - Eruptions, Types, Magma | Britannica
2024年11月12日 · Volcano - Eruptions, Types, Magma: Volcanoes are frequently classified by their size and shape (as is described in the section Volcanic landforms), but they can also be classified by their eruptive habits.
Volcanism | Examples, Effects, & Facts | Britannica
6 天之前 · Volcanism, any of various processes and phenomena associated with the surficial discharge of molten rock, pyroclastic fragments, or hot water and steam, including volcanoes, geysers, and fumaroles. The majority of active terrestrial volcanoes and related phenomena occur where two tectonic plates meet.
Volcanic eruption | Description, History, Mythology, & Facts
2024年10月21日 · A volcanic eruption is an eruption of molten rock, hot rock fragments, and hot gases through a volcano, which is a vent in a planet’s or satellite’s crust. Volcanic eruptions can cause disastrous loss of life and property.
volcano - Students | Britannica Kids | Homework Help
Volcanoes occur mainly near the boundaries of the tectonic plates that make up Earth’s surface layer. They form along belts of tension, where plates diverge, and along belts of compression, where plates converge. Nearly 1,900 volcanoes are active today or are known to have been active in historical times.
Volcanologist Janine Krippner Explains the Science Behind …
Volcanologist Janine Krippner dives into the details of how volcanoes work and the different types of lava flows.
Volcano - Pinatubo, Philippines, 1991 | Britannica
2024年11月12日 · Volcano - Pinatubo, Philippines, 1991: Earthquakes and steam explosions announced the reawakening of Mount Pinatubo in 1991, surprising many geologists because Pinatubo was not even listed in catalogs of world volcanoes.
Volcano - Calderas, Magma, Eruptions | Britannica
2024年11月12日 · Volcano - Calderas, Magma, Eruptions: Most calderas—large circular or oval depressions more than 1 km (0.6 mile) in diameter—have been formed by inward collapse of landforms after large amounts of magma have been expelled from underground.
Volcano - Eruptions, Cone, Magma | Britannica
2024年11月12日 · Volcano - Eruptions, Cone, Magma: Stratovolcanoes such as Mayon Volcano in the Philippines, Mount Momotombo in Nicaragua, and Ol Doinyo Lengai in Tanzania are steep cones built by both pyroclastic and lava-flow eruptions.