posted on Jan, 19 2011 @ 08:17 AM
Originally posted by stereologist
reply to post by CUin2013?
Since you realize that you do not understand these concepts I recommend going to the library and getting a book on an introduction to geology and
reading it or taking an intro course at a college.
CUin2013... here's a link & snipprt that might be of use in your defense...consider the following a mini-course,
and a comment at the end from my POV
paleomagnetic records show that the dipole polarity of the geomagnetic field has reversed many times in the past, the mean time between reversals
being roughly 200,000 years
with individual reversal events taking only a couple thousand years.
These observations argue for a mechanism within the Earth's interior that continually generates the geomagnetic field. It has long been speculated
that this mechanism is a convective dynamo operating in the Earth's fluid outer core, which surrounds its solid inner core, both being mainly
composed of iron. The solid inner core is roughly the size of the moon but at the temperature of the surface of the sun. The convection in the fluid
outer core is thought to be driven by both thermal and compositional buoyancy sources at the inner core boundary that are produced as the Earth slowly
cools and iron in the iron-rich fluid alloy solidifies onto the inner core giving off latent heat and the light constituent of the alloy. These
buoyancy forces cause fluid to rise and the Coriolis forces, due to the Earth's rotation, cause the fluid flows to be helical. Presumably this fluid
motion twists and shears magnetic field, generating new magnetic field to replace that which diffuses away. However, until now, no detailed
dynamically self-consistent model existed that demonstrated this could actually work or explained why the geomagnetic field has the intensity it does,
has a strongly dipole-dominated structure with a dipole axis nearly aligned with the Earth's rotation axis, has non-dipolar field structure that
varies on the time scale of ten to one hundred years and why the field occasionally undergoes dipole reversals.
of course read the link further and it will put forth an explaination as to how a lava flow in a Nevada location could have an anomalous magnetic
the N-S polarity in that Nevada find does not necessarily indicate a global shift of some 53º of the Earth's pole, it definitely does record the
sites lava cooling with a 53º difference to the present N-S pole alignment...