Geo-Joint: Gibraltar

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Even if you’re not sure where it is, you’ve heard of the name or seen it on an insurance logo. The Rock of Gibraltar has an iconic status as something solid and prominent, which it definitely is. And you may know that it lies at the very western end of the Mediterranean Sea, on the similarly named, Strait of Gibraltar. …


Geo-Joint: Streets with no Names

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Living in the USA, you grow up with street names. The name of the street you lived on when you were just a tyke may have been among the earliest names you learned, so that Mom could hope to get you back if you wandered off and were found by a friendly policeman. Just like people, streets have names, or …


Geo-Joint: Underwater Logging

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Logging is one of the most dangerous jobs you can do. Knocking over big heavy things using sharp running power tools on slippery slopes and dragging them to somewhere else using heavy equipment – what could go wrong? However, even if done injury-free, unfortunate circumstances can hinder the operation. In logging’s older days, felled logs would be dragged down to …

Remarkable Rivers: depending upon the kind of geography and geology in a drainage basin, that stream course will develop its own individual qualities

Geo-Joint: Remarkable Rivers

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Water flows downhill, and takes the easiest path that gravity pulls it along. Depending upon the kind of geography and geology in a drainage basin, that stream course will develop its own individual qualities, from sculpted rocks, to unique water chemistries, to particular plant assemblages. The Cristales River, or Caño Cristales, in Colombia is one such “special circumstances” river. Its …

Magnetic Pole Reversal

Geo-Joint: Magnetic Pole Reversal

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Way back in 1906, a French geologist named Bernard Brunhes made a fascinating discovery. He knew that previous studies had shown that baking pottery or bricks caused iron particles in the clay to align in a north-south orientation. Heat of sufficient intensity causes the electrons in iron to go into a high-energy state and become “looser,” facilitating realignment. In studying the clays over which lava had once flowed, he found that iron particles in both the lava and the baked clay underneath it had the same orientation. Then further study in places where there were multiple layers of lava showed that different lava layers had opposite alignments. The only logical explanation was that, amazingly enough, the magnetic poles of the earth must be periodically reversing.


Geo-Joint: Foreign fruit

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Suppose someone offered you a Chinese gooseberry. Or a carambola. How about a slice of durian? Some jackfruit? Care for a rambutan? What? These are all fruits from faraway places, some of which you may have tried, but probably don’t consume as much as you do apples, oranges and grapes. It’s a good bet you’ve had Chinese gooseberry, but not by that name. It was a fruit imported from China to New Zealand in 1904. People thought its flavor resembled a gooseberry (and of course we all know what those taste like) so “Chinese gooseberry” was a logical name. The names “mihou tao” or “yang tao,” as the Chinese called them, didn’t roll off the New Zealander’s tongues quite so easily…

Planet X

Geo-Joint: Planet X

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For the longest time, we were all taught that there were nine planets in the solar system. From closest to, and farthest from the sun, they were: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Sadly, Pluto fell off the list when astronomers determined that its small size and failure to fulfill all the gravitational functions of a bona fide planet disqualified it. So we were down to being eight fellow spheroids in our neighborhood, commonly known as the Solar System. Recently, however, two astronomers (one of whom made the case for Pluto’s ouster) have postulated the existence of a replacement ninth member, one that’s in the club but doesn’t come by for a meeting very often…

Sea level changes

Geo-Joint: Sea Level Changes

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When was the last time you sat down into a hot bath and the water was up to your chest, but barely covered your anklebones? That just couldn’t happen, given what we know about liquids flowing to conform to the shape of their container. But the rules change, or get more complicated, when you get to a container the size of an ocean basin. Because of these changed circumstances, some parts of the world are already suffering from sea level rise, and others are barely aware that it’s happening.