Curriculum Portal

neurologyYou need to know

• The coast is the zone where land meets the sea, with landscapes including rocky cliffs, sandy beaches, dunes, mudflats, estuaries and salt marshes.
• Coasts support habitats, settlements, tourism and transport, but are dynamic environments that change through weathering, erosion, transportation, deposition, sea-level change and human activity.
• Igneous rocks form when molten rock cools, sedimentary rocks form through processes such as sediment compaction and cementation, and metamorphic rocks form when existing rocks are changed by heat and pressure without melting.
• The rock cycle links rock types through weathering, erosion, deposition, compaction, cementation, heating, pressure, melting and cooling, while features such as fossils and sediment layers preserve evidence of past environments.
• Weathering breaks down rock in situ: physical weathering breaks it without changing its chemistry, chemical weathering changes its composition, and biological weathering involves living organisms such as plant roots widening cracks.
• Wind transfers energy to the sea to generate waves, with stronger winds, longer wind duration and a longer fetch, the distance wind blows across open water, generally producing larger waves.
• Swash carries water up a beach and backwash returns it seawards, with constructive waves having relatively stronger swash that builds beaches and destructive waves having stronger backwash that removes beach sediment.
• Coastal erosion wears away and removes material through hydraulic action, where waves force water and compress air into cracks; abrasion, where sediment scrapes rock; attrition, where sediment particles collide and become smaller and rounder; and solution, where soluble minerals dissolve.
• On discordant coastlines, rock bands meet the coast roughly at right angles, allowing less resistant rock to retreat into bays, such as Swanage Bay, while more resistant rock remains as headlands, such as Ballard Point.
• Transportation is the movement of sediment, and longshore drift moves it along a beach in a zig-zag pattern as oblique waves drive swash up the beach at an angle and gravity draws backwash down the beach slope.
• Deposition occurs when water loses energy and drops sediment, and a spit is a narrow ridge attached to land at one end that grows where longshore drift deposits sediment beyond a bend in the coastline or across an estuary.
• Hard engineering uses built structures to reduce coastal erosion or flooding, often providing rapid protection but requiring substantial expenditure and potentially disrupting habitats and sediment movement.
• Sea walls form a barrier that reflects wave energy but can increase erosion at their base, while rock armour uses large boulders to dissipate wave energy but can be expensive to transport and install.
• Groynes extend across beaches to interrupt longshore drift and retain sediment, creating wider protective beaches but reducing sediment supply and potentially increasing erosion further down-drift.
• Soft engineering works with natural processes, including beach nourishment, which adds sand or shingle to create a wider beach that dissipates wave energy but needs replenishment as sediment is removed.
• Dune regeneration uses vegetation and measures such as fencing to trap sand and stabilise dunes, strengthening a natural buffer against coastal flooding while requiring protection from trampling.
• Managed retreat allows selected coastal land to flood or erode through withdrawing or relocating defences, potentially reducing long-term costs and creating intertidal habitats but sacrificing land and sometimes requiring compensation.
• The Holderness coast lies in the East Riding of Yorkshire on England's North Sea coast, where weak glacial till, also called boulder clay, is rapidly eroded by waves, with average retreat commonly around 1–2 metres per year but substantial local variation.
• Coastal erosion at Holderness threatens homes and communities, causes economic losses through damage to farmland, businesses and roads, and changes ecosystems through cliff retreat and habitat loss.
• Holderness management includes sea walls and groynes at towns such as Hornsea and Withernsea and rock groynes and rock armour at Mappleton, but protecting selected locations can reduce down-drift sediment supply and create conflict with neighbouring communities.

• Identify cliffs, beaches, dunes, estuaries, salt marshes, headlands, bays and spits on maps and photographs using their visible shape and position.
• Classify rocks as igneous, sedimentary or metamorphic from descriptions of their formation, and annotate a rock-cycle diagram with the processes linking them.
• Distinguish weathering from erosion in coastal examples, explaining how physical, chemical or biological weathering weakens rock before waves remove it.
• Explain hydraulic action, abrasion, attrition and solution using labelled diagrams or coastal examples that distinguish their mechanisms.
• Compare constructive and destructive waves using swash, backwash and sediment movement, and predict how changing wind strength, duration or fetch affects wave energy.
• Sequence the formation of headlands and bays on a discordant coastline, linking differential erosion to rock resistance and identifying Swanage Bay and Ballard Point as examples.
• Draw annotated diagrams of longshore drift and spit formation, showing wave approach, angled swash, downslope backwash, net sediment movement and deposition beyond a change in coastline direction.
• Compare sea walls, groynes, rock armour, beach nourishment, dune regeneration and managed retreat using protection, cost, maintenance, habitat effects and impacts down-drift.
• Locate Holderness on a UK map and explain its rapid retreat using its weak glacial till and exposure to North Sea waves.
• Assess coastal management at Holderness using named locations, distinguishing social, economic and environmental impacts and explaining why protection benefits some communities while disadvantaging others.