What makes a volcano erupted

This kind of eruption can be caused by natural events such as typhoons, which decrease rock density, and glacial melting on the top of the volcano which alters the molten rock composition. Volcanoes are formed by eruptions of lava and ash when magma rises through cracks or weak-spots in the Earth's crust. A build up of pressure in the earth is released, by things such as a plate movement which forces molten rock to exploded into the air causing a volcanic eruption.

There are three different types of volcano and each produces and releases a different type of lava:. We pay for your stories! Do you have a story for The Sun Online news team? Email us at tips the-sun.

A volcanic eruption is when lava and gas are released from a volcano—sometimes explosively. The most dangerous type of eruption is called a 'glowing avalanche' which is when freshly erupted magma flows down the sides of a volcano.

They can travel quickly and reach temperatures of up to 1, degrees Fahrenheit. Other hazards include ash fall, and lahars mud or debris flows.

Volcanoes often cause population displacement and food shortages. Learn your volcano risks and warning signs and look out for unusual physical changes around volcanoes, such as increased ash fall or vegetation drying up. Learn and participate in early warning systems and develop plans for both evacuating and sheltering in place.

Be aware of secondary hazards such as landslides, lahars mudflows , ash and thunderstorms. Protect your home from volcanic ash and cover water sources if time allows. Avoid driving during and after ash fall when visibility can be very low and roads are slippery. Protect your lungs and eyes by wearing protective gear such as goggles and masks. Pay particular attention to vulnerable people and support them to evacuate or shelter in place.

There are two known natural causes for these buoyant bubbles. Sometimes, new magma from deeper underground brings additional gassy compounds into the mix.

But bubbles can also form when magma begins to cool. In its molten state, magma is a mixture of dissolved gases and melted minerals. As the molten rock hardens, some of those minerals solidify into crystals.

Not all eruptions are due to rising magmastatic pressure— sometimes the weight of the rock above can become dangerously low. Landslides can remove massive quantities of rock from atop a magma chamber, dropping the lithostatic pressure and instantly triggering an eruption. Helens in But unloading can also happen over longer periods of time due to erosion or melting glaciers. In fact, many geologists are worried that glacial melt caused by climate change could increase volcanic activity.

Finally, eruptions can occur when the rock layer is no longer strong enough to hold back the magma below. Acidic gases and heat escaping from magma can corrode rock through a process called hydrothermal alteration, gradually turning hard stone into soft clay.