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Can Rocks Grow?

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Rolf:
"Rocks can grow taller and larger

When children grow, they get taller, heavier and stronger each year. Rocks also grow bigger, heavier and stronger, but it takes a rock thousands or even millions of years to change.

You can find rocks growing taller and bigger in caves and hot springs. In caves, rocks grow because water flowing along walls or dripping from the ceiling leaves behind minerals along the cave wall or floor, said Cory BlackEagle, a geologist at the University of Kentucky in Lexington and chair of the Geological Society of America's Karst Division. Cave rocks are usually composed of minerals such as calcite, aragonite, opal, chalcedony and others. Rocks formed by this dripping water are called stalactites when they grow down from the ceiling and stalagmites when they grow up from the floor. [In Photos: Stunning Stalagmite Structures Discovered in French Cave]"

More:

http://www.livescience.com/32234-can-rocks-grow.html

Torstein:
Kanskje det er derfor jeg sliter litt med noen passasjer jeg taklet fint for 20 år siden.

cato sture:
Kanskje Hans-Øvind har noen gode råd for forsering av passasjer som plutselig er blitt mindre?

mvh

Rolf:
Merkelig det der. Jeg synes passasjer er blitt større med årene  ::)

cato sture:
Jeg kan egentlig ikke svare på om passasjene er blitt hverken større eller mindre med årene , for jeg sliter stadig mer med i det hele tatt å se dem...  ;)

Cato

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