15. Bars: These form in the same way as a spit initially but bars are created where a spit grows across a bay, joining two headlands. Behind the bar, a lagoon is created, where water has been trapped and the lagoon may gradually be infilled as a salt marsh develops due to it being a low energy zone, which encourages deposition. Example of a Bar: Slapton Sands - Devon.
24. Changes in sea level affect the formation and continued existence of coral reefs and atolls Coral is sensitive to heat and light it is also sensitive to changes in sea level as reefs cannot survive long periods of sub-aerial exposure. Falls in sea level can lead to the death of coral and to the emergence of the reef above high water forming low lying land such as keys. The islands become colonized by vegetation. To a certain extent reefs can contend with sea level rise leading to the growth of thick reefs (Darwins model). However rapid rise consequent upon global warming may result in inundation and destruction.
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28. Describe and explain the features shown below and account for the Differences between the storm and swell profiles. STORM & SWELL PROFILES.
30. Coastal management Explain how human activities have affected the physical environment in a coastal area or coastal areas you have studied. Explain the problems of the sustainable management of a stretch or stretches of coastline you have studied.