The fact they are being erupted together.
Ash and pumice are common materials.
Dopey Dopey Dope
it is alternating layers of pyroclstic materials
it is alternating layers of pyroclstic materials
Lava, ash, pumice and molten debris.
Composite volcanoes usually do not erupt mafic material. Intermediate material is the most common. The mafic material they do erupt is usually basalt.
Magma and lava also crust?
No. Volcanoes erupt.
About 60 volcanoes erupt each year.
An unlimited amount of volcanoes can erupt at once
Volcanoes can erupt at any time of year.
Gaseous matter such as H2O, SO2, CO2. Solid materials such as ash, lava, bombs.