Script For Mt St Helens
Mt St Helens – Script
Introduction of Theory
From the deepest ocean trenches to the highest mountain rangers, plate tectonics explain all of the features from the past and present. A plate tectonic is a theory that was developed in the 1960s. According to the concept, Earth has a rigid layer called the lithosphere, which is normally 100km thick. The lithosphere is broken up into seven large continental and oceanic plates, six or seven medium sized regional plates, and various small ones. These plates do not move very far very quickly, and they usually slide around 5 to 10cm per year. There are three types of boundaries and they are the divergent, convergent and transform boundaries.
Plates, Boundaries and Zones
There are about 30 different plates that glide along the mantle. There are three plate boundaries, they are the divergent plate boundaries, transform plate boundaries and the convergent plate boundaries. Divergent plates move away from each other and are found in the middle of major oceans. These boundaries help to form underwater volcanoes and create new oceanic crust. Transform plates are plates that slide past each other and this is what causes earthquakes. If …show more content…
Helens happened in 1980 where, within 15 to 20 seconds, a 5.1 magnitude earthquake occurred. This lead to a massive landslide from the volcanoes bulge and where the summit slid away. Before the eruption it was a symmetrical cone that was about 3,000 metres above sea level. But the eruption removed about 396 metres off the top. Between October 16th, 1980 and October 21st, 1986, there were 17 eruptive episodes that have helped build a new lava dome. Coupled with these episodes were hundreds of small bursts or explosions of gas and steam. Mt. St. Helens has had four major eruptions and lots of minor ones. Volcanoes erupt due to the pressure of the magma and earth, and then erupts if a plate moves. Here is an image of the volcano before and after the eruption in
Introduction of Theory
From the deepest ocean trenches to the highest mountain rangers, plate tectonics explain all of the features from the past and present. A plate tectonic is a theory that was developed in the 1960s. According to the concept, Earth has a rigid layer called the lithosphere, which is normally 100km thick. The lithosphere is broken up into seven large continental and oceanic plates, six or seven medium sized regional plates, and various small ones. These plates do not move very far very quickly, and they usually slide around 5 to 10cm per year. There are three types of boundaries and they are the divergent, convergent and transform boundaries.
Plates, Boundaries and Zones
There are about 30 different plates that glide along the mantle. There are three plate boundaries, they are the divergent plate boundaries, transform plate boundaries and the convergent plate boundaries. Divergent plates move away from each other and are found in the middle of major oceans. These boundaries help to form underwater volcanoes and create new oceanic crust. Transform plates are plates that slide past each other and this is what causes earthquakes. If …show more content…
Helens happened in 1980 where, within 15 to 20 seconds, a 5.1 magnitude earthquake occurred. This lead to a massive landslide from the volcanoes bulge and where the summit slid away. Before the eruption it was a symmetrical cone that was about 3,000 metres above sea level. But the eruption removed about 396 metres off the top. Between October 16th, 1980 and October 21st, 1986, there were 17 eruptive episodes that have helped build a new lava dome. Coupled with these episodes were hundreds of small bursts or explosions of gas and steam. Mt. St. Helens has had four major eruptions and lots of minor ones. Volcanoes erupt due to the pressure of the magma and earth, and then erupts if a plate moves. Here is an image of the volcano before and after the eruption in