WEATHERING

Slide 1

• THE BREAKDOWN OF ROCK IN SITU. AT OR CLOSE TO GROUND SURFACE. LEADS TO TRANSFER OF MATERIAL.
• IF RATE OF DEBRIS REMPVAL EXCEEDS RATE OF WEATHERING, POSITIVE FEEDBACK OCCURS. RATE OF WEATHERING INCREASES
• IF DEBRIS REMOVAL SLOW, LEADS TO SCREE, NEGATIVE FEEDBACK. REDUCES EXPOSURE OF CLIFF. WEATHERING CREATES SEDIMENT THAT THE SEA CAN USE TO HELP ERODE COAST

MECHANICAL

• BREAK UP OF ROCKS WITH NO CHEMCIAL CHANGES
• FREEZE THAW - WATER ENTERS CRACK. FREEZES IN COLD WEATHER, EXPANDS IN VOLUME BY ABOUT 10%, EXERTS PRESSURE ON ROCK. CRACK WIDENS.