[DOC] [TLE] Geomagnetic reversal - Wikipedia [PAR] A geomagnetic reversal is a change in a planet's magnetic field such that the 
positions of magnetic north and magnetic south are interchanged, while 
geographic north and geographic south remain the same. The Earth's field has 
alternated between periods of normal polarity, in which .... The rate of reversals in 
the Earth's magnetic field has varied widely over time... [DOC] [TLE] Pole Reversal Happens All The (Geologic) Time | NASA [PAR] Nov 30, 2011 ... Earth's magnetic field has flipped its polarity many times over the millennia ... 
north with a magnetic compass in your hand, the needle would point to 'south. ... 
The magnetic north pole has been creeping northward  by more than .... much 
ice these glaciers will contribute to the ocean in a changing climate. [DOC] [TLE] What If Earth's Magnetic Poles Flip? - Live Science [PAR] Feb 10, 2012 ... If Earth's magnetic field reversed, compasses would point toward ... When north 
goes south, they say, the continents will lurch in one ... The geologic record 
shows that hundreds of pole reversals have occurred throughout Earth's history; 
they ... "It's not a sudden flip, but a slow process, during which the field... [DOC] [TLE] Earth's magnetic field could flip within our lifetime - but don't worry ... [PAR] Oct 21, 2014 ... Earth's magnetic north pole, vs. true/geographic north pole ... New satellite data 
from the ESA shows that the Earth's magnetic field is weakening 10 times faster ... 
suggested that a geomagnetic reversal occurs over thousands of years. ... molten 
core to change  and thus the north and south poles switch. [DOC] [TLE] Is it true that the Earth's magnetic field is about to flip? | physics.org [PAR] It's thought that the Earth's magnetic field is generated by the molten iron core at 
the ... and the Earth's magnetic field moves around, with the magnetic north pole 
... over time gives us an idea of what has happened to the magnetic poles in the 
past. These studies show that the poles switch ends every half million years or so
... [DOC] [TLE] BBC - Earth - Earth's magnetic field now flips more often than ever [PAR] Nov 10, 2014 ... The planet's magnetic field is becoming less stable. ... fact the magnetic poles 
have swapped places many times in the Earth's history. ... At its centre is a solid 
inner core surrounded by a fluid outer core, which is hotter at the bottom. ... field 
varies, and the positions of the north and south magnetic poles shift. [DOC] [TLE] Magnetic Reversals [PAR] What do we mean by a magnetic reversal or a magnetic 'flip' of the Earth? How 
often do reversals occur? Is the Earth's ... The Earth has a magnetic field, as can 
be seen by using a magnetic compass. It is mainly ... The magnetic field is largely 
that of a dipole, by which we mean that it has one North pole and one South pole. [DOC] [TLE] Polar Opposites: What Would Happen To Us If The North Pole ... [PAR] Mar 5, 2015 ... Scientists have predicted that a reverse of the Earth's magnetic poles ... Polar 
Opposites: What Would Happen To Us If The North Pole Suddenly Became The 
South? ... As the poles slowly flip, the magnetic field begins to progressively lose 
... shifts have occurred at least 170 times in Earth's history, it's likely... [DOC] [TLE] Sunrise in the WEST: Scientists warn magnetic poles SWITCHING ... [PAR] Aug 12, 2015 ... SCIENTISTS have warned Earth could be heading towards an ... warn North 
could be SOUTH as Earth's magnetic poles SWITCH ... Geologists have said this 
event has happened a number of times in Earth's history - with the last one ... said
: "It's not a sudden flip, but a slow process, during which the field... [DOC] [TLE] Earth's Magnetic Field Flip Could Happen Sooner Than Expected ... [PAR] Jul 9, 2014 ... Earth's magnetic field, which protects the planet from huge blasts of ... while the 
field has strengthened over

Question: In Earth's history, this field has flipped over many times switching its north & south poles
Answer: Magnetic field