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Geology: Granite in the North Pennines
Granite is lighter than other rocks, meaning that gravity is slightly less strong in places where there is a lot
of granite in the earth's crust. Measurements of gravity in the North Pennines showed that the force of gravity
is low here, and it is lowest in Rookhope. This means you weigh very slightly less in Rookhope than anywhere else
in the NorthEast!
In 1960-61 a borehole over 600m deep was drilled at Rookhope and finally proved the existence of the Weardale
Granite. The presence of the granite also helped to support the theory of how veins were formed. As a result
Rookhope is now famous amongst geologists all over the world.
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