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JC GEOG
Weathering and Erosion
| Term | Definition |
|---|---|
| mechanical weathering | frost, sudden temperature change, plants and animals |
| chemical weathering | action of chemicals on rock e.g carbonic acid |
| freeze thaw action | frost action ,water in cracks freezes and expands so splitting rocks |
| scree | loose heaps of rocks |
| carbonic acid | rain passing through the atmosphere joins with carbon dioxide to form a weak carbonic acid |
| karst landscape | exposed limestone at the surface |
| limestone pavement | grikes and clints on the surface, karst landscape |
| grike | cracks in limestone pavement |
| clint | surface rocks in limestone pavement |
| swallow/sink holes | where a river disappears underground |
| caverns | cave underground formed by river erosion of limestone |
| stalactites | slender column of calcite hanging from a cavern ceiling |
| stalagmites | thick column of calcite forms on the cavern floor |
| pillars | when a stalactite and stalagmite meet |
| bedding planes | horizontal cracks that separate the limestone layers |
| joints | vertical cracks that separate the limestone layers |
| Burren Co Clare | Karst landscape in Ireland |
| erosion | breaking down and carrying away of rock by water ,ice and wind |
| weathering | breaking down of rock |