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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 |