Volcanic Eruptions

Describe Pyroclastic material and lava flow

What is pyroclastic material?

Pyroclastic material is fragments of rock that form during a volcanic eruption made by felsic lava which has silicon and feldspar and is why its a light color.Having many trapped gases cause it to have a high viscosity rate.
Pyroclastic flows and lava flows at Etna volcano

Classified Mafic Lava Types

There are three different mafic lava flows.These three lava flows include pahoehoe,Aa,and blocky lava.Pahoehoe is a least viscous type of mafic lava,which forms from hot fluid lava.As it cools it forms a smooth,ropy texture.Aa is a more kinda viscous lava it forms when lava that has the same composition as pahoehoe lava.Aa lava's texture results from differences in gas content and in the rate and slope of the lava flow.Blocky lava is the most viscous type of mafic lava.It has a higher silica content than aa lava which make blocky lava more viscous than aa lava.The high viscosity causes the cooled lava at the surface to break into large chunks while the hot lava underneath continues to flow.This process is what gives the lava flow a blocky appearance.
Kilauea a'a Lava Flow

Types of Volcanoes

The three different types of volcanoes form depending on what type of eruption it produces,such as quiet or explosive eruptions.Lava and pyroclastic material that are ejected during volcanic eruptions build around the vent and form the cone of the volcano.An explosive volcano has felsic magma made out of silica and feldspar and has many trapped gases and a high viscosity rate which causes it to become explosive and violent.Which forms cinder cone and composite types of volcanos.A quite eruption has mafic magma made up of magnesium and iron which has less trapped gases and has a low viscosity rate causing it to erupt quietly and forms volcanos such as Shield volcanos.
When Earth Erupts-Cinder Cone Volcanoes