The world’s largest volcano, Mauna Loa in Hawaii, is a shield volcano. Mauna Loa is about 55,770 feet (17,000 meters) from its base beneath the ocean to the summit, which is 13,681 feet (4,170 meters) above sea level.
https://www.livescience.com/27295-volcanoes.html
Types of Volcanoes. Many people are interested in ways to classify volcanoes. There is probably a natural human instinct to try and give labels to all things. This is not a bad instinct and many times it makes it easier to understand the particular thing that is being classified.
http://volcano.oregonstate.edu/book/export/html/198
Volcanic plugs: When magma solidifies in the fissure of a volcano the hard dense rock may form a “neck” that remains when softer surrounding rock has been eroded away.
https://www.livescience.com/27295-volcanoes.html
A volcano is a vent or fissure in Earth's crust through which lava, ash, rock and gases erupt. A volcano is also a mountain formed by the accumulation of these eruptive products. Let's take a look at how volcanoes form: Earth's crust is 40 to 250 miles (64 to 402 kilometers) thick. It is broken up into 14 major and 38 smaller pieces called tectonic plates.
https://www.livescience.com/27295-volcanoes.html
Eruptions at shield volcanoes are only explosive if water somehow gets into the vent, otherwise they are characterized by low-explosivity fountaining that forms cinder cones and spatter cones at the vent, however, 90% of the volcano is lava rather than pyroclastic material.
http://volcano.oregonstate.edu/book/export/html/198
The lava at strato volcanoes occasionally forms 'a'a, but more commonly it barely flows at all, preferring to pile up in the vent to form volcanic domes. Some strato volcanoes are just a collection of domes piled up on each other.
http://volcano.oregonstate.edu/book/export/html/198
Shield Volcanoes. Shield volcanoes are the largest volcanoes on Earth that actually look like volcanoes (i.e. not counting flood basalt flows). The Hawaiian shield volcanoes are the most famous examples. Shield volcanoes are almost exclusively basalt, a type of lava that is very fluid when erupted.
http://volcano.oregonstate.edu/book/export/html/198
Unfortunately, there is one particular volcano classification system that many people think is the only system. Not only is it not the only system, it is not a very good system. This is the famous 3 types of volcanoes (shield volcanoes, strato volcanoes, and cinder cones), and it is found in many textbooks from elementary school to college. Why is this 3-types scheme so bad?
http://volcano.oregonstate.edu/book/export/html/198
A volcano is an opening in Earth's crust where magma breaks through, raining down molten rock, ash and gases. There are several types of volcanoes.
https://www.livescience.com/27295-volcanoes.html
Volcano forms new island Magma and lava from a Japanese volcano is forming new geography in a remote part of the Pacific Ocean. The Japanese Coast Guard took video of it.
https://www.cnn.com/videos/world/2015/02/28/pkg-orig-volcano-forms-new-island-japan.cnn
what forms a volcano
A volcano is also a mountain formed by the accumulation of these eruptive products.