What causes solidification of volcanic lava?

A fundamental issue in igneous petrology is the understanding of magma solidification. Solidification is the result of a complex interplay between crystallization and solution. Magma in a chamber can be reheated by the addition of a new hotter magma or by convective self-mixing.

What can happen when there is a large amount of cool lava in the sea?

When lava meets the sea it cools quickly while boiling the ocean into steam. The billowing steams clouds can be deadly as they contain small glass shards of fragmented lava and acid mist from sea water. When lava hits seawater at temperatures of around 2,100 degrees Fahrenheit it heats the sea water dry.

What kind of volcanic eruption when there are large amount of pyroclastic?

Stratovolcanoes show inter-layering of lava flows and pyroclastic material, which is why they are sometimes called composite volcanoes. Pyroclastic material can make up over 50\% of the volume of a stratovolcano.

What effect does thick lava have on volcanic eruptions?

A good example is the eruptions at Hawaii’s volcanoes. Lava flows rarely kill people because they move slowly enough for people to get out of their way. If magma is thick and sticky, gases cannot escape easily. Pressure builds up until the gases escape violently and explode.

Why does a volcano fed by highly viscous magma pose the greatest threat to life and property?

TestNew stuff! List three factors that determine the nature of a volcanic eruption. What role does each play? Why is a volcano fed by highly viscous magma likely to be a greater threat to life and property than a volcano supplied with very fluid magma?

What is the relationship between the type of eruption to the shape and height of volcano to be produced?

Molten rock is less dense than the surrounding rock, so it is buoyant and rises, just like hot air. Each eruption can produce layers of lava that will later become volcanic rock. These layers build the volcano. Depending on how viscous the lava is will depend on the shape.

Why do some volcanic eruptions consist mostly of lava flows while others are explosive and do not produce flows?

Why do some volcanic eruptions consist mostly of lava flows, while others are explosive and do not produce flows? Because of its viscosity. If it has high viscosity (felsic) then gas and volatiles cannot escape easily and pressure is built up causing an explosive eruption.

What is the difference between lava and pyroclastic flow?

The difference between lava and pyroclastic flows lies on its speed. Lava creeps slowly and burns everything in its path but pyroclastic flows destroys nearly everything by land and air, its speed is usually greater than 80 km per hour, but it can reach 400 km per hour.

How does the viscosity of lava affect the shape of a volcano?

And the lava viscosity defines the size and shape of a volcano. Even though lava is 100,000 times more viscous than water, it can still flow great distances. When lava has low viscosity, it can flow very easily over long distances. It can also clog up the volcanic vent and form blocks that resist the flow of lava.

Why is a volcano with high viscous magma more of a threat to life and properties than a volcano with low viscous magma?

A volcano fed by highly viscous magma is likely to be a greater threat to life and property than a volcano supplied with very fluid magma because with high viscous magma gas is trapped more in the magma so the gas will build up and then eventually explode, whereas with fluid magma the gas can escape allowing the magma …