Monday, June 4, 2012

Simple Art of Plate Tectonics Draft #2

Sorry if I'm boring you guys, but again I am still in for like, another nine days:(
Why are there volcanoes, you may ask?
Scattered across the land and sea?
Above the surface
With magma chambers
Like a fiery furnace?
And why are there earthquakes,
That shake the earth beneath
And why do they happen
Thousands of feet deep?

It's called plate tectonics.
Somewhere far below they're moving
And they're moving apart,
Next to
Each other.
They make mountains and trenches
They cause earthquakes and eruptions
And much, much more.

There are many things the plates are responsible for
But let's start with the theory of continental drift.
As fast as your fingernails grow
The plates move
Over a long period of time.
They were together
But it couldn't last forever
And in time they split.
The place called PANGAEASplit into the world today
So now we're left with fossils
In places they normally wouldn't be
Leading us to this conclusion in this way.

So this leads us to the ocean
Where all this evidence can be seen
Where the ranges are new and the trenches are old.
The new crust forms mountains
The old crust subducts
And this is the movement that causes the continents to drift.
They have to keep moving to keep growing
And that's the process of seafloor spreading.

How is this possible and how are they moving?
It takes heat
A convection current
With energy to release.

Igneous rocks: Formed through cooling and solidification of lava.
Metamorphic rocks: Formed from intense pressure and heat.
Sedimentary rocks: Formed under heat and is a combination of many rocks.

So now we're in our final lesson.
What more is there to learn?
You learned on Page 4 that the plates move in different directions.
You learned that the plates make mountains and trenches, earthquakes and islands.

But How?
At a convergent boundary, you may find mountain ranges, maybe even volcanic ones!

At a divergent boundary, you may find trenches.

At a transform boundary, also known as a strike-slip fault, you may find earthquakes.

Earthquakes can happen anywhere, near any plate boundary. Why? Because any time the plates move, it causes earthquakes. And since they are constantly moving, if you live in Japan or Hawaii or somewhere else near a boundary, you will experience a lot of seismic activity.

What is seismic activity?
An earthquake, tremor, or tremblor that is a result of a sudden release of energy in the earth's crust.

Mountain ranges are beautiful and cna be found almost anywhere.
They can even be found underwater, when oceanic plates collide to make mountian ranges.

Trenches happen when plates subduct.
That's why the ocean floor is younger than the continental crust, because it goes down, melts, and forms again.

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