work of waves
DESCRIPTION
Work of Waves. Learning objectives: …Explain the processes of erosion, deposition and transportation at the coast. …Explain how the process of erosion creates caves, arches and stacks. …Identify different types of erosion and weathering that occur on the coast. - PowerPoint PPT PresentationTRANSCRIPT
Work of Waves
Learning objectives:…Explain the processes of erosion, deposition and transportation at the coast.…Explain how the process of erosion creates caves, arches and stacks.…Identify different types of erosion and weathering that occur on the coast.
Prediction…How may this change in 1000 years
The formation of headlands and bays
Cracks Become Caves
Cave formation on Ballintoy coast, Ireland
http://www.youtube.com/watch?v=2fS2Swi0q-U&feature=related
Caves Become Arches
An arch on Lighthouse Field state
beach, California
Arches Become Stacks
A stack on the South Devon coast
• Joint or fault in resistant rock• Roof of arch becomes too heavy to be supported and collapses• A stack is an isolated part of a cliff• The stack us undercut and collapses to leave a stump• Waves cut through headland to form an arch which is continually
widened at its base• Abrasion and hydraulic action of waves widens the weakness in
the cliff to form a cave• Chemical weathering from the waves and rain cause the rocks to
be weathered• Biological weathering from roots occurs at the top of the rock.
Terminology used today:New words:HeadlandBayCliffCrackCaveArchStack Stump Coastal retreat
Words we should have also used:ErosionWeatheringHydraulic actionSolutionAttritionabrasion
• http://www.bing.com/videos/search?q=formation+of+a+stack+coasts&view=detail&mid=0928E2F0EE5E7E3E134D0928E2F0EE5E7E3E134D&first=0
• http://www.bing.com/videos/search?q=formation+of+a+sea+stack&view=detail&mid=3560880BE2BA51435BB53560880BE2BA51435BB5&first=0