1. Glaciation in Snowdonia - Some Post-Glacial Changes to the Landscape

2. 2 Snowdonia – Post Glacial Changes Post-glacial screes due to frost shattering on the slopes above.

3. 3 Snowdonia – Post Glacial Changes Fluvial erosion has cut through the morainic deposits in Cwm Idwal.

4. 4 Snowdonia – Post Glacial Changes Lakes have been infilled as shown by these lake deposits in the Nant Ffrancon valley.

5. 5 Snowdonia – Post Glacial Changes Soils and vegetation have developed on both the bare rock and morainic surfaces left after the ice retreated.

6. 6 Snowdonia – Post Glacial Changes Grazing by sheep has resulted in a distinctive grassland flora; trees and heather only occur where sheep are unable to graze.

7. 7 Snowdonia – Post Glacial Changes Footpath erosion is a problem in many popular sites.

8. 8 Snowdonia – Post Glacial Changes Many paths have been paved, as in Cwm Idwal.

9. 9 Snowdonia – Post Glacial Changes Where walkers keep to the path the surrounding vegetation is able to recover from erosion.

10. 10 Snowdonia – Post Glacial Changes The small, old Cwm Dyli H.E.P. scheme has left a pipeline eyesore; The new scheme at Dinorwig is hardly visible.