The type of volcano built almost entirely from ejected lava fragments is called a cinder cone volcano.

Here's why:

* Erupted material: Cinder cones are formed primarily from pyroclastic material, which are fragments of lava that solidify in the air after being violently ejected from the volcano. These fragments range in size from fine ash to large bombs.

* Conical shape: The accumulation of these ejected fragments creates a cone-shaped volcano, often with a steep slope.

* Relative size: Cinder cones are generally small in size, rarely exceeding 300 meters (1,000 feet) in height.

While other volcanic types like stratovolcanoes also involve pyroclastic material, their structure is more complex, incorporating lava flows and other volcanic deposits alongside ejected fragments. Cinder cones are almost purely built from these fragments, making them distinct in their composition.