Edexcel GCSE Geography A (1GA0) — The Physical Environment
Imagine looking at a satellite photo of a coastline and being able to instantly peel back the sand to see the rock type beneath, or rewinding 100 years to see exactly where the cliffs used to be. This is exactly what geographers do when investigating the impacts of human intervention. By using digital tools, we can analyse how building a wall in one place might accidentally cause a flood or accelerate erosion somewhere else.
To analyse how human engineering affects physical processes, geographers combine specific layers:
When using GIS to investigate an area, geographers rely on specific interactive tools:
GIS allows geographers to accurately calculate how fast a coastline is retreating by comparing georeferenced historical maps (e.g., from 1900) with current satellite imagery (e.g., 2024).
The formula for the rate of erosion is:
Step 1: Use the measurement tool on the GIS to find the distance between the historical shoreline and the modern shoreline.
Step 2: Calculate the time difference between the two layers.
Step 3: Substitute the values into the formula.
Step 4: Calculate the final answer with units.
To systematically investigate how human land use impacts flood risk, you can combine multiple tools:
Students often refer generically to "looking at digital maps". To secure higher marks, always name specific data layers you would combine (e.g., "overlaying a land-use layer onto a flood-risk layer").
When tackling an "Analyse" question on human intervention, you must explain the knock-on spatial effects, such as how channelising a river increases erosion downstream, or how a groyne starves a downdrift beach of sediment.
Be prepared for Paper 3 fieldwork questions where you may need to discuss GIS as a data presentation method, such as overlaying qualitative geolocated field photos or quantitative proportional symbols onto a base map.
GIS (Geographical Information System)
A digital system designed to capture, store, manipulate, analyse, and present all types of geographical data in layers.
Data Layer
A distinct dataset (e.g., geology, roads, or land use) that can be superimposed on a map to see spatial relationships.
Georeferencing
The process of assigning real-world coordinates to a map or image so it can be accurately layered with other spatial data.
Attribute Data
Information that describes the characteristics of a spatial feature, such as the specific type of crop in an agricultural land-use layer.
Topographic Map
A map representing physical features of the land, including relief (elevation) using contour lines.
Hard Engineering
Man-made structures, such as sea walls, groynes, or dams, used to control natural processes.
Terminal Groyne Syndrome
Accelerated erosion of a coastline immediately downdrift from the last groyne in a series, caused by the interruption of longshore drift.
Soft Engineering
Coastal or river management using natural processes (e.g., beach nourishment, flood plain zoning) to protect the environment.
Managed Retreat
A strategy where current defences are abandoned, allowing the sea to flood land to create new natural habitats like salt marshes.
Elevation Profile
A GIS tool that visualises the change in height along a transect line, used to analyse flood defences or cliff profiles.
Buffering
A GIS tool that creates a zone of a specific distance around a feature to help analyse risks like flooding or pollution.
Put your knowledge into practice — try past paper questions for Geography A
GIS (Geographical Information System)
A digital system designed to capture, store, manipulate, analyse, and present all types of geographical data in layers.
Data Layer
A distinct dataset (e.g., geology, roads, or land use) that can be superimposed on a map to see spatial relationships.
Georeferencing
The process of assigning real-world coordinates to a map or image so it can be accurately layered with other spatial data.
Attribute Data
Information that describes the characteristics of a spatial feature, such as the specific type of crop in an agricultural land-use layer.
Topographic Map
A map representing physical features of the land, including relief (elevation) using contour lines.
Hard Engineering
Man-made structures, such as sea walls, groynes, or dams, used to control natural processes.
Terminal Groyne Syndrome
Accelerated erosion of a coastline immediately downdrift from the last groyne in a series, caused by the interruption of longshore drift.
Soft Engineering
Coastal or river management using natural processes (e.g., beach nourishment, flood plain zoning) to protect the environment.
Managed Retreat
A strategy where current defences are abandoned, allowing the sea to flood land to create new natural habitats like salt marshes.
Elevation Profile
A GIS tool that visualises the change in height along a transect line, used to analyse flood defences or cliff profiles.
Buffering
A GIS tool that creates a zone of a specific distance around a feature to help analyse risks like flooding or pollution.
