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 up of felsic magma which contains silicon and feldspar and is more viscous and has more trapped gases and is a lighter color.

What are the types of Mafic Lava Flow?

Mafic lava flows is low viscosity and is made up of magnesium and iron which is also known as mafic magma and has less trapped gases and is also dark colored. There are three types of mafic lava flows Pahoehoe, Aa, and Blocky lava. Pahoehoe forms from hot, fluid lava. Once it cools down it forms into a smooth and ropy texture. Aa forms from lava from the same compositions as pahoehoe lava and the lava texture results from differences in gas content. Blocky lava with high viscosity causes cooled lava on earths surface to break into large chunks with hot lava underneath still flowing.

Types of Mafic Lava

Types of Volcanoes

Volcanic activity 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 build up around the vent and form volcanic cones. Volcanic cones are classified as three main types. A shield volcano has a low viscosity and less trapped gases and its a quite eruption