Mount St. Helens captured my imagination and ignited in me a passion for Earth Sciences.
In 1986, my sister and I were taken on a road trip and seeing the recovery in the dead zones and the shocking clear boundaries of the disaster zone.
Normal forest, oddly melted looking forest, sudden ash and nothing but petrified tree trunks. Almost like a nuclear detonation had just removed all life and colour.
But this was later and there were bits of greenery and insects.
But Mt. St. Helens was a small event in the cascade mountains and impacted Washington State US and spewing ash into all US bordering states and the Canadian provinces of BC and Alberta.
This was not a world event like the more recent Icelandic one: Ellajokull which shut down air traffic over Europe and gave the world a reminder of the last big Iceland explosion, known in Europe as The Year Without a Summer. The ash cloud caused a winter, resulting in crop failure and starvation in the early 1800s.
this was not the first one that impacted on a massive scale. in the 1800s one erupted and reduced summer to 2 weeks – massive starvation owing to crop failures followed. The volcanic dust shut down air traffic to Europe and probably gave us a 10,000 year break on global warming by lowering temperatures. It gives a chilling insight into what the first stage of a super volcano would be – the last one of those went off 75,000 years ago and reduced the human population to 10,000 or so and we bounced back from that to over 7 billion today. yellowstone park is a supervolcano that will take out 2/3s of America when it blows and the populated part of Canada.
Mount Vesuvius in Italy’s eruption kill zone includes about 5 million people. Isn’t trivia reassuring?
as if volcanos weren’t scary enough, there’s supervolcanos.
The last one that erupted was 75,000 years ago and reduced the estimated human global population of 1 million down to 10,000.
to really understand volcanoes and to make sure we stop wasting virgins by tossing them in to prevent eruptions
we have learned about
Global Plate Techtonics
Molding and shaping the earth – from plate passing each other, to fold mountains, to volacanos, earthquakes and tsnunamis – the earth is a boiling gooey ball that warps and wafts as it spin dances around the sun
just to give a more global idea:
I remember learning that there were three states of matter
air liquid solid
these are not exactly true because there is plasma and other types of matter depending on heat and pressure.
so the core of the earth is not a liquid or a solid, but something hotter and inbetween.
the flow from down below causes the motions and is impacted by the orbit and spin of the earth – gravitational pull of other bodies
Earth Sciences – global air, water, heating, soil redistribution
Waves, peaks and troughs, are force and magnitude
how things move
metamorphatizing tantizing transformational
as magma is to rocks, water is to glaciers
Glaciers – Water in Hard Core Mode
see also: http://nsidc.org/cryosphere/glaciers/
from the mantle
to the land and water and air
magma plumes water jets tornados
density and media
hot springs, geysers, mudpool
heated and vented
springs, pools, streams and run off
water repleated replenished
we are shaped
by the forces acting on us