Volcanic Eruptions

Describe pyroclastic material and lava flows

What is pyroclastic material?

Pyroclastic material is fragments of rock that form during a volcanic eruptions. Pyroclastic material is made out of felsic magma that is made out of silicon and feldspar that is why it has a lighter in color. Felsic is very viscous and has more trapped gases that is why it causes a violent eruption.

What are the Types of Mafic Magma?

Mafic lava has a low viscosity its made out if magnesium and iron which makes it dark in color, it has less trapped gases. There are three types of Mafic Lava Flow are Pahoehoe, Aa Lava and Blocky Lava. Pahoehoe forms from hot, fluid lava. As it cools it forms a smooth ropy texture. Aa forms from lava that has the same composition as pahoehoe lava. Aa lavas texture result from differences in gas content and in the rate and slope of the lava flow. Block lava has a higher slican content than Aa lava does, which makes block lav more viscous that cause it to the lava to cool at the surface and breaks into large chunks.

Types of lava

Lava Flows

Types of volcaneos

Volcanic activty produces a variety of characteristic features that form during both quiet and explosive eruptions. The lava and pyroclastic material that are ejected during volcanic eruptions blued up around the the vent and form cones. Volcanic cones are classified as three types of volcaneos. The shield volcaneos are quiet eruptions because of mafic magma, the mafic magma has less trapped gases. Cinder cones are violent eruptions they have Felsic magma which has more trapped gases. Composite volcanos are both quiet and violent eruptions it has layers pyroclastic and different type of magma for example Felsic and mafic. The composite volcano are Alston known as Saratovolcanoes.