X-ray Vision.(CAT scan use to show liquid flow in soiil)

Resource: Engineering & Technology for a Sustainable World | December 1, 2000| | Copyright

CAT scans show how liquids flow through tiny tunnels in soil

Worms and roots burrow into soil leaving trails that can quickly carry applied pesticides and other chemicals into ground water.

Although many researchers have tried to determine the shapes and sizes of these "macropores," they cannot see through soil far enough to develop characteristic models.

To get a deeper view of the tracks and their patterns graduate student Johan Perret at McGill University's Macdonald Campus in Montreal, Quebec, Canada, took a medical approach. He and other McGill ...

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