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some volcanoes are more active than others because some volcanoes lie on plate boundaries that move frequently which adds more pressure to the magma chamber where all of the lava is stored. Other volcanoes are formed but do not gain much pressure because they have been formed slowly or have errupted many times before and do not gain any more pressure. Some volcanoes are temperarily dormant which means they are not active. Some volcanoes have been dormant for hundreds of years because there is not enough pressure for the volcano to errupt. Hot countries may have an affect or volcanoes that started off very close to the epi-center of the earth, that has lava flowing up to the volcanoes frequently from there, which may set them off more. I hope this has answered your question.
What else can I help you with?
What is the comparative form of active?
"More active" and "less active" are a few of the possible comparatives for active. Native English grammar gives "activer, activest," while adopted French grammar gives "more active, most active." Some people think the native English form always "sounds wrong" when used with imported adjectives of Romance origin, and even on some polysyllabic native adjectives.
How are composite volcanoes and shield volcanoes different?
Composite volcanoes or Stratovolcanoes are your typical cartoon image of volcanoes, very tall, narrow craters at the top, steeper sides often snow capped peaks. Shield volcanoes tend to not be as tall and have much more shallow sloping sides. The reason for this is due to their products and location. Composite volcanoes produce lava which is much more viscous (thicker) than shield volcanoes, which tend to produce a thinner runnier lava. This is due to the Silica (SiO2) content of the lavas. Composite volcanoes tend to be produced by more Acidic lavas (with a higher Silica content) where as shield volcanoes are produced by lavas with a more Basic composition, (a lower silica content). Composite volcanoes (Mt St Helens, Vesuvius, Mt Fugi) tend to be formed near destructive plate boundries where one tectonic plate is being subducted beneath another. When the subducted plate reaches roughly 700 km depth it begins to enter the Aesthenosphere, a layer of more ductile rock deep in the mantle. The water content of the subducted plate causes the aesthenosphere to partially melt. The molten magma begins to rise in plumes towards the surface. As the magma plume rises it has a lot of contact with the surrounding rocks it passes through, and it absorbs silica from them, arriving at the surface as a viscous silica rich melt. Shield volcanoes (Mauna Loa, Kiluea, Hekla) are more common over constructive plate margins where two plates are pulling apart. When the plates pull apart it de-pressurises the mantle beneath the plates and causes it to partially melt. The Magma rises up the cracks between the two retreating plates, with little contact to the surrounding rocks, and so picks up very little silica content. This causes it to reach the surface as a runny basic lava. The runny nature of shield volcanoes means that lava flows travel a long way from the volcano crater, causing little build up on the surrounding flanks of the volcano. The viscous nature of Composite volcanoes means that the lava doesn't travel very far and builds up on the sides of the volcanoes making them much steeper. Shield volcanoes are more often active than composite volcanoes, some erupt near constantly for many decades. Composite volcanoes erupt far less often, and can be mistakenly thought of as being extint for hundreds of years between eruptions. Composite volcanoes tend to have much more explosive eruptions than shield volcanoes, which tend to be more effusive in nature. Composite volcanoes are capable of pyroclastic flows (Mt St Helens) and huge eruptions which can entirely destroy the volcano (Pinatubo, Krakatoa). Shield volcanoes tend to only erupt in lava flows, which can create enormous shallow volcanoes (Mauna Loa, Olympus Mons)
Is there a relationship between earthquake locations and mountain ranges?
No it can't because the formation is not the same as the others but it can be linked to block mountains and formed as a volcanoes. But others say it is possiable for it to happen and many say it can't but scientist say that some people discovered that their theory is acatuall right and the others are stupid
What are some instruments and equipment used to investigate earthquakes and volcanoes?
seismograph
What are some volcanoes that begin with the letter J?
· Jingbo (China) · Jocotitlan (Mexico)
Do deserts have volcanoes?
Yes, many deserts have volcanoes. Some are active, some are dormant and others extinct.
A sentence for dormant?
Some volcanoes are active, while others are dormant.
Do all volcanoes erupt lava?
Lava emissions are found with all active volcanoes, although some volcano emit more lave than others.
How many volcanoes do we have in the Philippines?
http://en.wikipedia.org/wiki/Category:Volcanoes_of_the_Philippines
How do you use Volcano in a sentence?
A ring of volcanoes surrounds the northern Pacific Ocean, some of which are active and spew lava and others of which are dormant mountain peaks.
How many volcanoes have been active in the western US in the past 2000 years?
There have been around 50 active volcanoes in the western US in the past 2000 years. These include both major and minor volcanic events, with some volcanoes experiencing more frequent eruptions than others.
Some Caribbean islands are formed from the tops of underwater mountains while others are formed from .?
active volcanoes
Are the volcanoes on all of the volcanic islands active?
Most volcanoes are not active but some are. It is very rare for a volcano to be active. :-)
4 Some Caribbean islands are formed from the tops of underwater mountains while others are formed from?
active volcanoes
What volcano is the weakest in the world?
It is difficult to determine the weakest volcano in the world as each volcano has its own unique characteristics. Volcanic activity can vary greatly, with some volcanoes being dormant for centuries while others are active more frequently. Some smaller or less known volcanoes may be considered weaker compared to more well-known and active ones.
How many active volcanoes are there in Europe?
there are more than 45 active on land volcanoes in Europe.
What active volcanoes are there?
yes there is a active volcano's there r some in Hawaii
