Changes

The highest hill in the range is Cross Fell in [[Cumbria]] (2930 feet). The only higher mountains in England are in the nearby [[Lake District]]. Other notable hills of the Pennines are [[Kinder Scout]] (Derbyshire), Ingleborough Hill and Pen-y-Ghent (Yorkshire) and Whernside (Cumbria).

The highest hill in the range is Cross Fell in [[Cumbria]] (2930 feet). The only higher mountains in England are in the nearby [[Lake District]]. Other notable hills of the Pennines are [[Kinder Scout]] (Derbyshire), Ingleborough Hill and Pen-y-Ghent (Yorkshire) and Whernside (Cumbria).

The central Pennines are formed from the [[Jurassic]] [[limestone]] of the Alston Tilt Block. In addition to typical [[karst]] landscape of scarps and [[limestone pavement]]s on the surface, there are many caves in the [[Yorkshire Dales]]<ref>http://www.sat.dundee.ac.uk/arb/yorkshire/</ref>, including Britain's longest cave system, the [[Three Counties System]], and its deepest single shaft at Gaping Ghyll. There are also caves in the [[Peak District]].<ref>http://w01-0504.web.dircon.net/pdc/caveguides.htm</ref>

The central Pennines are formed from the [[Jurassic]] [[limestone]] of the Alston Tilt Block. In addition to typical [[karst]] landscape of scarps and [[limestone pavement]]s on the surface, there are many caves in the [[Yorkshire Dales]]<ref>http://www.sat.dundee.ac.uk/arb/yorkshire/</ref>, including Britain's longest cave system, the [[Easegill System]], and its deepest single shaft at Gaping Ghyll. There are also caves in the [[Peak District]].<ref>http://w01-0504.web.dircon.net/pdc/caveguides.htm</ref>

== Economy ==

== Economy ==