Which type of volcano has steep angled sides, throws blobs of lava in the air that fall as cinders, and is built over a short period of time? Cinder cone

Composite

Lava dome

The volcano in question is a cinder cone volcano.

Explanation:

There are multiple types of volcanoes, and their types are determined by their formation, appearance, and eruptions, which are actually all related to one another. One of the types of volcanoes is a cinder cone volcano. This type of volcano is a short-lived volcano that actually occurs at the flanks of other types of volcanoes, forming from the larger vents of the preexisting larger volcanoes.

As mentioned, the cinder cone volcanoes occur near other larger volcanoes. When the larger volcanoes have bigger eruptions, the vents propel a lot of magma toward the surface, resulting in the formation of a cinder cone volcano. Because they emerge very quickly and how they erupt the material they have very steep sides. Because of their eruptions that shoot-out thick blobs of lava that fall as cinders they got the name cinder cone volcanoes.