![Top curves](../../../../jsp/jahia/templates/GSL/gsl_templates/img/keystage3/main_top_grad.gif)
Granite, Devon
![Granite hand specimen (pink)](../../../../webdav/site/GSL/shared/images/education_and_careers/RockCycle/RocksAroundBritain/Granite2%20resized.jpg)
Evidence from the radioactive elements they contain show that the granites of SW England cooled down about 300 million years ago.
Granite is a very resistant rock and weathers slowly to form thin soils with many large boulders sticking out - with typical tors forming the hill-tops as in the image below.
Granite, Dartmoor, Devon
![Granite on Dartmoor](../../../../webdav/site/GSL/shared/images/education_and_careers/RockCycle/RocksAroundBritain/PuTor%20xtrawide.jpg)
![Bottom curves](../../../../jsp/jahia/templates/GSL/gsl_templates/img/keystage3/bottom_curve.gif)