... But in 1952 Jan Hospers, studying basalts in Iceland, came with convincing proof that the first impression was the right one--that there existed long periods in the past, when the north-south magnetic polarity of the Earth was reversed . ...
... Actually Io is much smaller. Watchful readers may notice that the north-south magnetic polarity of Jupiter is the reverse of what it is for Earth. ...
... Actually Io is much smaller. Watchful readers may notice that the north-south magnetic polarity of Jupiter is the reverse of what it is for Earth. ...
... Actually Io is much smaller. Watchful readers may notice that the north-south magnetic polarity of Jupiter is the reverse of what it is for Earth. ...
... Such needles were in fact used for many years, and in 1831, when a British expedition located the northmagnetic pole in Northern Canada, they confirmed its location by using such a needle, which pointed straight down. ...
... In addition, they (and their groups) occur often in pairs so that the other has positive polarity (magnetic south, into the sun) and the other negative polarity (magneticnorth, out of the sun); changes in this polarity create a 22-year cycle. ...