Which of the following is not considered to be a pyroclastic material? ash lapilli cinders pahoehoe

The correct answer is pahoehoe.  

The constituents generated in the volcanic eruptions are known as pyroclastic material. Of the given options pahoehoe is not considered as a pyroclastic material. It is a kind of lava flow of basaltic rock, generally dark-colored with a ropey or smooth surface. It is one of the two prime forms of lava flow discharged from volcanoes of the Hawaiian kind, the other is aa.  

Pahoehoe lava is a usual kind of basaltic lava, which cools down producing billowy, smooth, or ropy surfaces. Generally, it is produced by various small breakouts of lava from an over-crusted irregular, inflating flat flow.  

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

it takes on an electronical energy