Key term
OCR GCSE Geography A J383
Ecosystems of the Planet
Topic overviewAbiotic and biotic components, and how ecosystems interactThe world’s biomes: where they are and what they are likeWhere the tropical rainforests are, and what they are likeWhere the coral reefs are, and what they are likeRainforest processes and nutrient cyclingTwo threatened ecosystems: a rainforest and a coral reef
Environmental Threats to Our Planet
Topic overviewClimate change through the Quaternary, and since 1000ADThe evidence for climate changeNatural causes of climate change, and the enhanced greenhouse effectThe consequences of climate changeThe world’s climatic regions and global atmospheric circulationHow global circulation produces extreme weatherTropical storms: causes, distribution and frequencyA drought caused by El Niño or La Niña
Fieldwork Skills
Geographical Skills
Topic overviewConstructing maps, and reading cross-sections and transectsCoordinates, scale, distance and reading information from a mapGradient, contours, spot heights and GISChoosing, constructing and presenting graphs and chartsReading and interpreting the main graph and chart typesNumber, area, scale and the relationships between unitsProportion and ratio, and measures of central tendency and spreadPercentages and percentiles, and designing data collection sheetsReading tables, and describing relationships in bivariate dataTrend lines and lines of best fitPredicting from data, and spotting weak statistical presentationDrawing and justifying conclusions from dataInterpreting images and written sources, and recognising biasJudging the limits of maps, graphs, statistics and images
Landscapes of the UK
People of the Planet
Topic overviewDefining and measuring developmentThe global pattern of development: ACs, EDCs and LIDCsWhy development is uneven, and the role of aidA developing or emerging country: its context and economyRostow’s model and the country’s path of developmentCities, megacities and world citiesWhy urban growth rates differ around the worldRapid urbanisation in poorer countries: causes and effectsA major city in a poorer or emerging country
People of the UK
Topic overviewThe UK’s trade, media and cultural links with the worldThe UK’s geographical diversity and its inequalitiesUneven development within the UK, and the effects of economic growthHow the UK’s population structure has changed since 1900Immigration into the UK in the twenty-first centuryUrban trends in the UK and their effectsA major UK city: its people, challenges and ways of life
UK Environmental Challenges
Topic overviewAir masses, the North Atlantic Drift and the UK’s extreme weatherA UK flood event: causes, effects and responsesHow people use, modify and change UK ecosystemsThe UK’s renewable and non-renewable energy sourcesChanging UK energy supply and demand, and sustainable useRenewables in the UK, and the future of fossil fuelsWhat shapes the UK’s energy choices
Geographical Skills
Proportion and ratio, and measures of central tendency and spread
- 3 things to know
- Component 03
Overview
Ratios, magnitude, frequency and proportion, calculating the mean and the median, the mode and modal class, the range, lower and upper quartiles and the interquartile range, cumulative frequency, and when the median is a better average than the mean.
What you need to know
Answer each one before you reveal it.
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Key term
Twenty of the 100 shops in a centre stand empty. What is the ratio of empty shops to occupied ones?
Key term
What does magnitude mean?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is a ratio?
Model answer
A comparison of two amounts measured in the same units, written with a colon, such as 3:1.
- 2
Twenty of the 100 shops in a centre stand empty. What is the ratio of empty shops to occupied ones?
Model answer
20:80, which simplifies to 1:4.
- 3
What does magnitude mean?
Model answer
The size of something measured on a scale, such as the magnitude of an earthquake.
- 4
What is frequency?
Model answer
The number of times a particular value or event occurs in a set of data or in a given period.
- 5
What is meant by proportion?
Model answer
The share that one part makes of the whole, written as a fraction, a decimal or a percentage.
- 6
How is the mean of a set of figures found?
Model answer
Add all the values together and divide by how many values there are.
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