Pyroclastic material includes lava that hardens in the air during eruption. a. True
b. False

True, a common cause of Pyroclastic flows is gassed expelled from a volcano during an eruption as well as dense, fast moving solidified lava pieces.

True Pyroclastic flows contain a high-density mix of hot lava blocks, pumice, ash and volcanic gas. They move at very high speed down volcanic slopes, typically following valleys.

2cool and cold temperature unless its an ever green tree