Types of Volcanoes and
the Shapes of Volcanoes
Types of Volcanoes
There are 3 different types of volcanoes:
1. Active - eruptions can be anytime and often.
2. Dormant - has been a while since it has erupted, but could at anytime.
3. Extinct, meaning it hasn't erupted in a very long, long time so it probably won't ever again.
Shapes of Volcanoes
How many different shapes of volcano are there?
The type of magma in the earth creates four different types volcanoes:
Shield Volcano - flat
If the magma is runny, the gas can escape easily and there will not be an explosion. The magma just comes out of the mountain and flows down the sides. Shield volcanoes are shaped like a bowl or shield in the middle with long gentle slopes made by the lava flows. Examples include the volcanoes in Hawaii and Mount Etna.
Composite Volcano - tall and thin
If the magma is thick and sticky (like honey), the gas cannot escape, so it builds up and up until it explodes sending out huge clouds of burning rock and gas. Composite volcanoes are steep-sided volcanoes composed of many layers of volcanic rocks, usually made from thick sticky lava, ash and rock debris (broken pieces). Composite volcanoes are also known as strato-volcanoes. Examples include Mount Fuji in Japan, Mount Cotopaxi in Ecuador, Mount Shasta and Lassen in California, Mount Hood in Oregon, Mount St. Helens and Mount Rainier in Washington and Mt. Etna in Italy
Cinder cones
Cinder cones are circular or oval cones built from erupting lava that breaks into small pieces as it shoots into the air. As small pieces fall back to the ground, they cool and form cinders around the vent.
Lava domes
Lava domes are formed when erupting lava is too thick to flow and makes a steep-sided mound as the lava piles up near the volcanic vent.
Volcanoes can have different shapes based on the type of eruption they have, the type of magma they produce, and the surrounding geological features. Stratovolcanoes, for example, have steep sides due to their explosive eruptions, while shield volcanoes have gentle slopes due to the flowing nature of their lava. The overall shape is also influenced by factors such as the volcano's history of eruptions and the presence of glaciers or water erosion.
Most volcanoes occur where two plates meet. When two plates move apart causing a gap, hot molten rock - called lava - rises up between them. This type of volcano occurs on the ocean floor and is mostly invisible. If the amount of magma is large enough, it rises above the surface of the ocean and an island is created.If two plates collide and one plate is forced beneath the other plate, the friction makes the first melt and magma rises up. Only a few volcanoes on earth are formed like this, but their eruptions are the most violent and dangerous ones. Sometimes volcanoes also form in the middle of the plates which are called hotspots. These are places that are connected by channels to the hot mantle of the earth.
Three main types of volcano are given below which are formed in distinct ways: -
Shield volcano
Shield volcanoes are almost completely basalt. When magma is very hot and flowing, gases can escape and eruptions are gentle with considerable amounts of magma reaching the surface to form lava flows. Shield volcanoes have a broad, flattened dome-like shape created by layers of runny lava flowing over its surface and cooling down. Because the lava flows easily, it can move down gradual slopes over large distances from the volcanic vents.
Composite volcano
Alternating layers of rock fragments and lava form these volcanoes. This is why they are called composite volcanoes. They are also known as strato-volcanoes. Composite volcanoes generally erupt in an explosive way. When very viscous magma rises to the surface, it usually clogs the crater pipe, and gas in the crater pipe gets locked up. This cause increase in pressure resulting in an explosive eruption. Although strato-volcanoes are usually large and conical, we have more shapes of them: concave, pyramidal, convex-concave, helmet-shaped, collapse caldera, nested, multiple summits, elongated along a fissure.
Caldera volcano
They form when huge amounts of magma erupts out of sub-surface magma chambers. The removal of magma leaves a void below the surface and the top collapses in to form the caldera. The resulting basin-shaped depression is roughly circular and is usually several kilometers or more in diameter. The lava erupted from caldera volcanoes is very viscous and generally the coolest with temperatures ranging from 650°C to 800°C and is called rhyolitic magma. Although caldera volcanoes are uncommon, they are the most dangerous. Volcanic hazards from this type of eruption include tsunami from caldera collapse, large pyroclastic surges and widespread ash fall.
Other types of volcanoes are mid-ocean ridges, monogenetic fields and flood basalts making in all 6 types.
Depends on magma source feeding them:
Types of Volcanoes and
the Shapes of Volcanoes
Types of Volcanoes
There are 3 different types of volcanoes:
1. Active - eruptions can be anytime and often.
2. Dormant - has been a while since it has erupted, but could at anytime.
3. Extinct, meaning it hasn't erupted in a very long, long time so it probably won't ever again.
Shapes of Volcanoes
How many different shapes of volcano are there?
The type of magma in the earth creates four different types volcanoes:
Shield Volcano - flat
If the magma is runny, the gas can escape easily and there will not be an explosion. The magma just comes out of the mountain and flows down the sides. Shield volcanoes are shaped like a bowl or shield in the middle with long gentle slopes made by the lava flows. Examples include the volcanoes in Hawaii and Mount Etna.
Composite Volcano - tall and thin
If the magma is thick and sticky (like honey), the gas cannot escape, so it builds up and up until it explodes sending out huge clouds of burning rock and gas. Composite volcanoes are steep-sided volcanoes composed of many layers of volcanic rocks, usually made from thick sticky lava, ash and rock debris (broken pieces). Composite volcanoes are also known as strato-volcanoes. Examples include Mount Fuji in Japan, Mount Cotopaxi in Ecuador, Mount Shasta and Lassen in California, Mount Hood in Oregon, Mount St. Helens and Mount Rainier in Washington and Mt. Etna in Italy
Cinder cones
Cinder cones are circular or oval cones built from erupting lava that breaks into small pieces as it shoots into the air. As small pieces fall back to the ground, they cool and form cinders around the vent.
Lava domes
Lava domes are formed when erupting lava is too thick to flow and makes a steep-sided mound as the lava piles up near the volcanic vent.
Although there are several different types of volcanoes, volcanoes of the same type can still look very different. This is because even though they are the same type their history and eruptive cycles can vary heavily. Another major factor is that volcanoes of the same type can have varying types of eruptive stages, and therefore these recent types of eruptions can greatly change the outward appearance of a volcano. For examples take Mt. Fuji (Japan) and Mt. St. Helens (Washington, U.S.). Recently Mt. Fuji has been in a relatively inactive state and the most recent eruptions were dome building types. In contrast Mt. St. Helens has been realtively active in recent geological terms and has been in a very explosive cycle of eruptions. This explains the major difference of appearances. Mt. Fuji is an almost perfectly conical shape, while Mt. St. Helens has a very large summit crater from the 1980 explosion and flank collapse.
There are three main shapes of volcanoes: shield volcanoes, cinder cone volcanoes, and stratovolcanoes. Each type has distinct characteristics based on its eruption style, lava composition, and shape.
Because sometimes they have explosions and change shape.
The inner core and the liquid outer core does.
It's a lava fun
Volcanoes can have various shapes depending on their eruption style and the material they are made of. Common shapes include shield volcanoes with gentle sloping sides, stratovolcanoes with steep-sided cones, cinder cone volcanoes with a circular or oval shape, and calderas which form when a volcano collapses into its emptied magma chamber.
Because of how the plates compress.
well... nothing can be the same can it so that is why :)
There are three main shapes of volcanoes: shield volcanoes, cinder cone volcanoes, and stratovolcanoes. Each type has distinct characteristics based on its eruption style, lava composition, and shape.
Because sometimes they have explosions and change shape.
The inner core and the liquid outer core does.
Volcanoes are cone shaped.
There are three types of volcanoes which have different shapes and types of eruptions. * Shield Volcanoes - are low and flat and have small, flowing eruptions. * Composite Volcanoes - are a mixture between shield volcanoes and cone volcanoes, their eruptions are explosive. * Cone Volcanoes - are the tallest and largest volcanoes, and they have VERY explosive eruptions.
cos they are
They look like cones
consistent eruptinon of volcanoes
It's a lava fun
Volcanoes can have various shapes depending on their eruption style and the material they are made of. Common shapes include shield volcanoes with gentle sloping sides, stratovolcanoes with steep-sided cones, cinder cone volcanoes with a circular or oval shape, and calderas which form when a volcano collapses into its emptied magma chamber.