There are three types of lowland heath according to their location and climate conditions : wet ( impervious rocks / clay preventing water drainage ), dry ( well drained ), and humid ( between the two types ).
2.
Some water originates as rain that flows into streams on impervious rocks on the plateau before sinking at the limestone boundary into cave systems such as Swildon's Hole, Eastwater Cavern and St Cuthbert's Swallet; the rest is rain that percolates directly through the limestone.
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