How do you describe a volcano?
A volcano is an opening in the earth’s crust through which lava, volcanic ash, and gases escape. Beneath a volcano, liquid magma containing dissolved gases rises through cracks in the Earth’s crust. As the magma rises, pressure decreases, allowing the gases to form bubbles.
How do you describe an active volcano?
Active volcanoes have a recent history of eruptions; they are likely to erupt again. Dormant volcanoes have not erupted for a very long time but may erupt at a future time. Extinct volcanoes are not expected to erupt in the future. Inside an active volcano is a chamber in which molten rock, called magma, collects.
What is the best definition of a volcano?
1 : a vent in the crust of the earth or another planet or a moon from which usually molten or hot rock and steam issue also : a hill or mountain composed wholly or in part of the ejected material. 2 : something of explosively violent potential.
How would you describe a volcano in your own words?
The word volcano is used to describe either a kind of mountain built up of volcanic rock or vent that pours out gas, molten rock and volcanic ash. Volcanoes are built by the accumulation of their own eruptive products: lava bombs, lava flows, pyroclastic flows and tephra.
What is volcanic eruption Class 9?
Volcanoes are ruptures in the crust of our planet Earth that allow hot gases, molten lava and some rock fragments to erupt by opening and exposing the magma inside.
What is an eruption?
noun. an issuing forth suddenly and violently; outburst; outbreak. Geology. the ejection of molten rock, steam, etc., as from a volcano or geyser. something that is erupted or ejected, as molten rock, volcanic ash, or steam.
When Volcano Erupts what happens?
The space for the magma to leave is very small and, as it travels, pressure builds, meaning it escapes violently when released. This escaping liquid rock becomes lava, which solidifies as it travels. Layers of lava build up over time, creating volcanoes.
What is the main reason why most lava flows aren’t a threat to human life?
What is the best reason why most lava flows aren’t a threat to human life? Lava flows usually don’t flow very quickly, so people can outrun them.
What characteristics of lava flows make them more dangerous?
Because lava flows are extremely hot – between 1,000-2,000°C (1,800 – 3,600° F) – they can cause severe burns and often burn down vegetation and structures. Lava flowing from a vent also creates enormous amounts of pressure, which can crush or bury whatever survives being burned.
Why lava is dangerous?
Deaths attributed to lava flows are often due to related causes, such as explosions when lava interacts with water, the collapse of an active lava delta that forms where lava enters a body of water, asphyxiation due to accompanying toxic gases, pyroclastic flows from a collapsing dome, and lahars from meltwater.
Which of these volcano types is the most highly explosive?
Was Mt Everest a volcano?
Formed from clashing of two tectonic plates – the Indo-Australian and Eurasian plates, Mount Everest is not a volcano. Mount Everest is a mountain. Mount Everest will never erupt! Mount Everest consists of sedimentary and metamorphic rock formed from the downward fold of earth crust on Tethys Sea.
What is the coolest volcano in the world?
Top 10 Stunning Volcanoes Around the World
- Eyjafjallajökull, Suðurland, Iceland.
- Kelimutu Volcano, Flores Island, Indonesia.
- Mount Kilimanjaro, Kilimanjaro National Park, Tanzania.
- Whakaari/White Island, Bay of Plenty, New Zealand.
- Sakurajima, Kyushu, Japan.
- Mount Etna, Catania, Sicily, Italy.
- Mount Teide, Tenerife, Canary Islands, Spain.