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My Geography lessons (Natural disasters)

The question I guess your thinking is why I have put this page as my GCSE one, the answer is that I have chosen Geography, now I am revising natural disasters, and some can come a dramatic destruction, my favourite film (excludes Attenborough) would have to mbe Dante's Peak, that is about Mt. St Helens.

 

Mount St. Helens is based in between two plate boundaries:

  • The north Amerian plate (on land)

  • Juan (pronounced as huoin) De fuca plate (oceanic or  Pacifc plate)

About any Geological structure, disasters and other natural things that you lot can think of. It's great, I've already learned lots of stuff, I have known it before, but I forget, I sometimes have to explain, things.

Pyroclastic flow:

A Pyroclastic flow comes from volcano's, when the top is blocked by a very thick layer of rock, pressure is built up by the blazing heat caused by the magma in  the chamber.

This URL goes straight to a video of one (this has not been tested) I think it shows you one of the Pyroclastic flows of Mount St. Helens, the ash cloud (as that's what it is) is 1,000*c and traveling at 250kph, anyone or anything caught up in this killers path will be instantly killed.

Mount St Helens became extinct for 7,000 years, and now she is back.

Your probably asking "what does he mean?" or "how is this possible?".

I'll explain, as you all know, the continental plates keep shifting on the surface but it also moves underground aswell, St Helens became extinct because it moved out of position, a active volcano has to be on a destructive plate, she moved off, then, roughly in 1980 another part of the destructive plate had moved under her, giving her access to the mantle.

Mount St. Helens is based in between two tectonic plates (tectonics are the agents of our shifting land), one is in the sea called Juan de Fuca, the west side of the pacific plate, and the North American plate, which is on the far west of north America, which runs for thousands of miles downwards towards South America.