Magnetic Reversals (Cool Geology Assignment)

When Do They Occur? What Are The Ramifications?

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What Exactly Is a Magnetic Reversal?
Who Discovered It? and How?
What Causes a Magnetic Reversal?
When Do They Occur? What Are The Ramifications?
Why are magnetic reversals important? What Needs To Be Done Now?
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When Do Magnetic Reversals Occur?

    Magnetic Reversals cannot be accurately predicted; therefore we can only create predictions on an average, based on past reversals that have been documented.  Magnetic Reversals have been known to go back as far as 330 million years. From that time, to when the Magnetic Field last reversed, which was 780,000 years ago (transitioned from a reversed polarity to it’s present normal polarity), 400 reversals have taken place; averaging a reversal every 700,000 years (Geological Survey of Canada 2007).  With those statistics on hand, it is no wonder why many people believe that the Earth may be entering a time of reversal.

 

    Click here Want More? to read more on dating the Reversals.

What Are The Possible Ramafications of A Magnetic Reversal?
 

    Like with most theories regarding predictions of Magnetic Reversals, it is equally difficult to predict what some of the ramifications to the Earth may be if one were to occur within the near future.  There are many theories circulating that it would mean the end of the world, or the dawn of the next Ice Age, or even that the entire Earth would be destroyed without the protective Magnetic Field, and the Earth would end up like Mars.  On the other hand, some facts about the Earth cannot be discarded, that in fact say the Earth would be just fine.

           

    As stated before, during a Reversal there may be the presence of many poles (North and South) all around the Earth, so this may affect anything or anyone that is relying on a compass.  Many have worried that this fact may cause severe problems with animals, such as birds and whales, which rely on the poles to migrate, but the contrary has been suggested.  A reversal takes thousands of years to occur, so it would seem logical that the animals would adapt and have “time to reorient themselves” (Bentley 2003).  In conjunction, we as humans have been on the Earth during a series of reversals and there has been no information found within research that shows problems between animal and human development during a reversal.  Nor, has any information been found that there is any correlation between Magnetic Reversals and mass extinctions “during geological history” (British Geological Survey 2007).

           

    Some other things the Earth could perhaps expect, is an increase in the amount of radiation exposure to our satellites and airplanes, but perhaps there would be enough of the ozone layer as well as a “residual field to provide protection for people”, which is no more exposure than what already occurs at the existing poles where the “field lines currently dip” (Bentley 2003).  There would also be an abundance of aurora activity, also known as the Northern Lights, being able to be seen all over the world as opposed to only being witnessed further up North.  Theorists have also stated that the ozone layer would also provide the Earth with protection during a Magnetic Reversal (due to the field decreasing in intensity up to ninety percent), “the ozone layer – which was thought to be vulnerable without a protective shield – the effects would be negligible unless there was a super-solar proton event, referring to the high-energy radiation that can accompany solar flares.  In any case, the ozone layer would bounce back from the heavy bombardment, healing itself in just two to three years” (Bentley 2003).
 
    The Earth has seen its share of Magnetic Reversals and has survived.  Granted, none have occurred while humans and civilization have been as developed as we are today, but as previously stated, it is nearly impossible to make precise declarations as to what might happen in hopes that humans and civilization can prepare.  We may just have to wait and see…

Isn't this sooo cool?
 
Crystal Kells 2008