Table of Contents
What is the process of a volcano exploding?
Volcanoes erupt when molten rock called magma rises to the surface. Magma is formed when the earth’s mantle melts. Another way an eruption happens is when water underneath the surface interacts with hot magma and creates steam, this can build up enough pressure to cause an explosion.
What happens when a volcano blows its top?
It tends to erupt so violently its top collapses and leaves a large basin shape in its place. The collapse leads to widespread fallout of ash and other hazards. Some caldera volcanoes are up to 90 kilometres across and are called supervolcanoes.
What do you call the top opening of a volcano?
The crater is the bowl shaped opening located at the top of the volcano. The crater is also the steep sided walls made of hardened lava that surround the main vent. Lava can flow from the main vent, but not all volcanoes eject large amounts of lava.
Which of the following forms when the top or side of a volcano collapses into the magma chamber?
Volcano Ch 18 Vocab
| A | B |
|---|---|
| crater | Depression that forms when the top or side of a volcano collapses into the magma chamber |
| shield volcano | Largest of the volcanoes |
| cinder-cone volcano | Forms as tephra ejected high into the air fall back to Earth and pile around the vent |
| composite volcano | Made of layers of tephra and lava |
What happens when a volcano erupts ks2?
When a volcano erupts, magma comes up and out through the vents. Magma is called lava when it’s outside the volcano. Depending on how thick the magma is, volcanoes can be different shapes such as shield, composite or dome. Ash from volcanoes is very good for growing things.
Which part of the volcano refers to an opening on the surface that emits lava gases ash or other volcanic materials?
vent
A vent is an opening on the surface of a volcano that emits lava, gases, ash or other volcanic materials. Some volcanoes have multiple vents, but there is only one main vent, or central vent.
What makes a volcano explode at the surface?
The conventional explanation holds that in explosive eruptions only, rising magma breaks or fragments as it approaches the surface, releasing bubbles that blow the magma out like champagne from an uncorked bottle.
What do you call the magma that erupts from a volcano?
Magma that has erupted is called lava. Some volcanic eruptions are explosive and others are not. The explosivity of an eruption depends on the composition of the magma. If magma is thin and runny, gases can escape easily from it. When this type of magma erupts, it flows out of the volcano.
What happens when a volcano erupts in Hawaii?
When this type of magma erupts, it flows out of the volcano. A good example is the eruptions at Hawaii’s volcanoes. Lava flows rarely kill people because they move slowly enough for people to get out of their way. If magma is thick and sticky, gases cannot escape easily.
Why do volcanoes not kill people when they erupt?
If magma is thin and runny, gases can escape easily from it. When this type of magma erupts, it flows out of the volcano. A good example is the eruptions at Hawaii’s volcanoes. Lava flows rarely kill people because they move slowly enough for people to get out of their way. If magma is thick and sticky, gases cannot escape easily.