Hard rocks (e.g., Gabbro) are resistant to weathering & erosion so a coastline made of granite (e.g., Lands End) will change slowly. Mudflows occur on very steep slopes along the coastline. Discordant coastlines form where geology alternates between bands of hard and soft rock (see image below). Coastal Erosion - Geography AS Over time the crack will erode further, as the result of erosional processes such as hydraulic action. Coastal Systems and Processes. WJEC A Level GeographyPast Papers, AQA GCSE Geography Past Papers Define cliff profiles A the shape of a cliff cross-section is known as the profile they owe their form to geology, sub-aerial processes and wave energy along a given stretch of coastline 2 Q What do variations in cliff profiles reflect? This results in the formation of headlands and bays. The platform typically has a slope of less than 4 degrees, which is often only fully exposed at low tide. Weaker rocks (e.g. The spring tide occurs twice in a lunar cycle and expands the tidal range by uplifting the elevated tide imprint and bringing down the low tide mark. CIE A Level Geography View the coasts menu. Erosional Landforms - A Level Geography Edexcel Revision - Study Rocket You seem to have disabled JavaScript. The rock face above the effects of wave action begins to overhang. A wave-cut platform is a wide, gently sloping surface found at the cliffs base and extends into the sea. Eduqas A Level GeographyPast Papers Where erosion excavates enough material along joint or bedding plane , a steep-sided inlet may be formed called a geo. Accessed 1 May, 2023. A particular excited state of the H\mathrm{H}H atom has j=1/2j=1 / 2j=1/2. A section of the coastline may be primarily affected by a large sea fetch, but due to its positioning, it may be protected from destructive waves. 4B Wave Erosion Processes - A-LEVEL GEOGRAPHY REVISION: EDEXCEL 2B.4B Wave Erosion Processes The importance of wave erosion processes (hydraulic action, corrosion, abrasion, attrition) and how they are influenced by wave type, size and lithology. Additionally, severe joints created by weathering can increase the rate of erosion. How do weather and climate affect river landscapes? This all takes place within a small segment of the land/ocean interface known as . Fissures: Much smaller cracks in rocks, often only a few centimeters or millimeters long but they also represent weaknesses that erosion can exploit. The hard rock shields the soft rock from erosion. Compared to cliffs with seaward dipping bedding planes, it is relatively steep and stable. What two geology characteristics are dominant in influencing cliff profiles? The video below shows a geo at North Landing, Flamborough. Sedimentary rocks form as layers of deposited sediment, either on the beds of ancient seas or rivers. Erosion rates vary depending on a variety of factors. What factors affect population density and distribution? Mass movement- rotational slide 1993 landslide- 1million tonnes of cliff failed cutting the 60m high cliff back by 70m Created semicircular promontory 200m wide Causes: 140mm rainfall in the 2 months previously, pore water pressure build up, poor drainage and the As the stream flows down the cliff, fluvial erosion (surface run off erosion(will attack the saturated permeable bed and lower impermeable stratum, reducing the angle of the cliff profile. Castleton A tourist honey pot in The Peak District, Case Study Inner City Redevelopment Londons Docklands. This can alter the arrangement of layers in cliff shapes. Which two characters are dominant? Coastal Fieldwork Techniques - Internet Geography Brainscape helps you realize your greatest personal and professional ambitions through strong habits and hyper-efficient studying. water percolating comes into contact with a large surface area that can be chemically weathered. Coastal environments are complex systems that involve the interaction of various factors, including the marine environment, natural environment, climate, biosphere, fluvial frameworks, structural processes, and human development and management. Solution: Weak acids present in ocean water can dissolve certain types of rock, such as chalk or limestone. PDF Coasts Case Studies - SchoolGeography.com In sedimentary rocks, joints form when rock is subject to compression or stretching by tectonic forces or weight of overlying rock. produce cliff profiles and micro features such as caves and arches. Waves attack the base of the newly exposed rock faces. Although you may be able to measure the height and depth of a wave-cut notch (if present), do not attempt to climb cliffs directly Its profile is steep but the softer (lighter in colour) rock has undergone differential erosion producing several notches. The cookie is used to store the user consent for the cookies in the category "Other. If you looked down on a coastline from above and saw the geology of the area, youd be able to see that the rock type changes as you approach the coastline and that the different rocks are arranged in bands.