What are Volcanos?

        Volcanos are eruptions from deep inside the earth that are  great explosions on the earths surface. Most volcanos occur on the edge of the continental plates of the world. A circle of volcanos called the Pacific Ring of Fire, is located around the edge of the pacific ocean. It is called the Ring of fire because it is a ring of volcanos that have either erupted, dormant, or are just waiting to erupt. The theory of Plate Tectonics is used to explain the relationship between volcanos and earthquakes.

    When volcanos erupt a type of material called magma is pushed to the top and is released into the air or just moves over the side of the volcano. When the magma is opened into the air it becomes lava. There are many different types of lava. There is liquid lava, which can be fast moving or slow moving. The rocks you see are made of cooled lava. And sometimes you may find a gemstone or a type of jewel in the slow cooling lava.

    Three types of volcanos are shield , cinder cone, and compost. A shield volcano is not steep and doesn't explode like everyone thinks all volcanos do. It actually lets the lava flow from the top making it look like a huge shield made of rock. A cinder cone volcano is the kind of volcano that everyone thinks of when you say volcano. What it does is it explodes from the top sending lava shooting into the air. This type of explosion  makes it a very steep volcano. And the last type of volcano is a compost volcano. A compost volcano is a combination of a shield and cinder cone volcanos. It can either be steep or not so steep. It can also exploded from the top or just let the lava flow  from the top.
 

Volcanos and their history:
                                                        Mount St. Helen's
       MT.St. Helen's is located in the United States in Washington. Its is on the the greatest known volcanos in the U.S. Mt St. Helen's has forests and fields on its base. It also has glaciers and snow. The 1980 eruption cleared a lot of the vegetation out and some is still growing or recovering back.
     Mt. St. Helen's is a stator volcano. The 1980 eruption sent tons of ash into the air . The ash covered more than 150 square miles of land. The ash that Mt St. Helen's pushed out even pushed logs into the lake called Spirit Lake. Spirit Lake is still partly covered in logs from the eruption of Mt St. Helen's.
                                                               

                                                Devils Tower
     Devils Tower is another well known volcano. Devils Tower is steep and is mostly made up of and igneous rock body. Its steep body is made from slow oozing magma. The rock around devils tower is about 40 millions years old and this rock is called Phondile.
     Devils Tower rises as high as 1,253 feet. It also towers above the nearby river called Belle Founche River.  Devils Tower is located in Wyoming and some say the long ago Devils tower gave refuge to seven little girls that where being chased by bears. There is an abundant amount of wildlife by Devils tower. Devils Tower is a national monument.
 

                                            Hazards of volcanos

    Hazards of volcanos come in any shape, size and detail. You would be putting your self in a volcanic hazards by living next to an active volcano, because when that volcanos erupts you would be in its direct path. Ay area potential close to an active volcano would have more damage than that of an area farther away from the volcano. Another hazard of volcanos is when the magazines put pictures of beautiful lava flowing from the volcano, which would convince you that living next to a volcano is safe.  For more information  click on Hazards
                                 
                                        Causes of Volcanos
    Causes of volcanic eruptions happens when the hot material under ground is pushed up. Then when the heat and pressure become so hot the magma of hot material bursts from the top. Another way an eruptions can occur is when the magma just flows over the edge. These are ways that different eruptions can occur.  For more information click on Causes
 
                                                           Signs of eruptions
     The signs that an eruptions may occur can happen in many different ways. One way it can erupt is that it you can feel small earthquakes. Another way is that you can see steam coming from the surface. And another way is that there are types of instruments that  can tell when an eruption is about to occur. All these ways can help save lives and money. Click here for more information: Signs