Volcanic Eruptions
Describe the pyorclastic material and magma
What is pyroclastic??
Pyroclastic material is high viscosity which is Felsic magma. It is light colored made out of silica and feldspar, and has more trapped gases.
Pahoehoe lava.
When mafic lava cools rapidly the crust forms on the surface of the flow. If lava continues to flow after it hardens into volcanic rock and it forms all wrinkly into smooth ropy volcanic rock.
Aa
Aa lava has more viscous then pahoehoe and when the crust deforms rapidly it forms to thick to form wrinkles so it brakes into jagged volcanic rock.
Blocky Lava
It has higher silica than Aa lava does, and has more blocky lava and viscous than Aa lava. The high viscosity cools the lava at the surface to break into large chunks and lava flows underneath continues to flow which makes the blocky appearance.