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A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava ... Erupting volcanoes can pose many hazards, not only in the immediate vicinity of the .... Like ...

Where do Volcanoes occur? - Geoscience Australia


Volcanoes can remain inactive, or dormant, for hundreds or thousands of years before erupting again. During this time they can become covered by vegetation ...

Why are there volcanoes? Why do they erupt? | Volcano World ...


Volcanoes erupt because of density and pressure. The lower density of the magma relative to the surrounding rocks causes it to rise (like air bubbles in syrup).

Where do most volcanoes occur? | Reference.com


Most volcanoes occur in the basin of the Pacific Ocean, also known as the Ring of Fire. ... Where do tsunamis mostly occur? ... When did Aconcagua last erupt?

How Do Volcanoes Erupt? - Universe Today


May 26, 2016 ... Volcanic eruptions are driven by a combination of mechanisms, which include pressure and heat in the Earth's mantle, as well as tectonic ...

10 Most Hazardous Countries For Volcanoes (Photos) - Live Science


Apr 10, 2015 ... Here are the countries most at risk of a deadly volcanic eruption, according ... though the volcano did not erupt, according to historical accounts.

Do volcanoes occur in the ocean? - NOAA's National Ocean Service


Volcanic eruptions occur only in certain places and do not occur randomly. This is because the Earth's crust is broken into a series of slabs known as tectonic ...

Where Does Volcanic Activity Occur? | Earth 520: Plate Tectonics ...


Volcanic activity occurs at two types of plate boundaries: mid-ocean ridges and subduction zones. At mid-ocean ridges, basaltic eruptions produce new sea-floor  ...

Why do volcanoes erupt? What creates eruptions? - eSchooltoday


Find out what the earth make-up is, and how extreme pressure build up inside the earth forces molten matter to be expelled out to the surface, causing a volcanic ...

Volcanoes - Weather Wiz Kids weather information for kids


An extinct volcano is one which has erupted thousands of years ago and there's no possibility of eruption. Why do volcanoes erupt? The Earth's crust is made up  ...

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USGS FAQs - Volcanoes General - How Do Volcanoes Erupt?


Some volcanic eruptions are explosive and other are not. How explosive an eruption is depends on how runny or sticky the magma is. If magma is thin and ...

Where do volcanoes occur? | Reference.com


Most volcanic activity occurs in the mountain ridges under the ocean. However, eruptions occur in other parts of the world as well; for example, Iceland and Italy ...

Where do volcanoes mostly occur? | Reference.com


Most volcanoes that result from hot spots have more gradual, less destructive eruptions. The Hawaiian Islands were formed by such a hot spot, with each ...