volcano

 Lesson#1-VOLCANOS

here are more or less 53 volcanos in the Philippines. And they are divided into 4 types which are Cinder cones,Composite,sheild,and lava domes the first is:

   
Cinder Cones-These Volcanos consist almost completely of movable rough cinder and practically no lava. They are minor Volcanos, Usually only about a mile across and up to about a thousand feet high 

history:Its age has been controversial since the 1870's, when many people thought it was only a few decades old. Later, the cone and associated lava flows were thought to have formed about A.D. 1700 or during a 300-year- long series of eruptions ending in 1851

Composite Volcanos-are typically tens of miles and 10,000 or more feet in height. As illustrated on the left they have moderately steep sides and sometimes volcanologists call this strato or composite volcano because they consist of layers of solid lava flows

history:The most known composite cone is Mount mayon
which erupted on December 29, 2009,prompting affected residents to spend Christmas and the New Year in evacuation centers 

Shield Volcanos-are bigger in size. However , they are not as dangerous as they seem to be. This is because the eruption of lava out of shield volcanos is not accompanied bt pyroclastic material. This makes the eruption reletively safer and it keeps the shield volcano safe,too