Asked in GeologyVolcanoesPlate Tectonics
Does magma erupt from the mantle?
Asked in Earthquakes
What triggers earthquakes around volcanoes before they erupt?
Asked in Volcanoes
What is the source of materials for volcanoes that erupt?
Asked in Volcanoes
How does a volcano erupt and what causes it to erupt?
When a destructive boundary of two tectonic plates occurs the oceanic crust sinks underneath the continental crust as it is more dense, the oceanic crust then melts in the subduction zone and becomes magma in the mantle, this increases the pressure in the mantle and causes the magma to shoot up the volcano shaft and burst out of the top, this is an eruption
How does lava erupt under water?
Asked in Geology, Volcanoes, Plate Tectonics
Why does magma rise slowly through the mantle?
The viscosity (resistance to runniness) of magma affects the rate at which it rises up through the mantle. High viscosity magma rises slowly because it's thick and sticky, and low viscosity magma rises quickly (like the big island of Hawaii). Low viscosity magma is less likely to erupt explosively because it has less chance to build up pressure. High viscosity magma is the opposite and a lot of pressure has to build up before it will erupt, which causes a more explosive/sudden eruption.
Asked in Geology
What is earth's mantle and where is it located?
The Earth's mantle is a region of the planet that starts below the crust, and ends at the core. It accounts for the largest portion of the Earth's volume, but what is the Earth's mantle made of? The Earth's mantle is about 2,970 km thick, making up about 84% of the Earth's total volume. You might think it's a liquid, since volcanoes erupt lava from the mantle. But actually, the magma is mostly solid rock . Magma is liquid rock that seeps out of the mantle and collects into pockets beneath the crust called magma chambers.