Hard rocks, a solid basement
Veit & Jenny
Although rocks appear to be absolutely stable and to remain in place forever, they are much more mobile than it at first appears. They move thousands of kilometres on tectonic plates, collide with each other and form mountains. Some mountains are still increasing in height, while others are shrinking. Along tectonic plate margins, there is often a high risk of earthquakes and volcanic activity. Besides, rocks have their own life, called rock cycle. The cycle explains how rocks are formed, but also how they are eroded and transported, e.g. by glaciers, wind or rivers, from high elevations and re-deposited in the valley. In addition, rocks represent an important foundation for the ecosystem, since they deliver many nutrients for plants. So it is worth having a closer look at rocks in this unit.

Conclusions Geology & relief Review test Rock cycle Orogeny through time Introduction Start Learning objectives Global tectonics History of discovery Rock types Regional examples
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29 August 2011
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