Pieces of rock and debris that are carried within lava and propelled through the air during an eruption are called

The answer is; pyroclast

They are formed in explosive  types of volcanoes . It is formed in various ways, It could be the explosive fragmentation of the solidified volcanic rock that blocked the vent. It could also be from the rapid cooling of lava that is violently ejected into the atmosphere. They differ in size from pyroclast ash to small rocks.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

its probably to later but whats the question