Cinder Cone Volcano
A Cinder Cone volcano is the steepist form of volcano, which is made up of volcanic rock that has already erupted. What happens when the volcano erupts is that the magma comes out and cools quickly, trapping gas particles in the magma rock. Cinder cone volcanos range anywhere from tens of metres high to over a couple hundred metres in the air. The Earth's most active Cinder Cone volcano is Cerro Negro(Nicaragrua) which was born in 1850 and has erupted over 20 times, most recently in 1992 and 1995. It is in a group of four young Cinder Cones northwest of the Las Pilas volcano.