Volcano Learning zone > Volcano Glossary
Cinder cones are compsed of volcanic rock fragments whcih have been ejected from a volcanic vents possibly as molten lava , cooled on their descent and droped downwind of the volcanic vent. Often made of scoria and tephra ( small volcanic rock fragments) they from quickly perhaps over a few days. They can 100 of metres tall. The rock fragments are cooled quickly and glassy in texture. They require low viscosity lava to form such as basalt.