How and why has climate changed during the Quaternary, and what is the evidence?
Key Idea 5.1: climate change during the Quaternary period, the evidence for natural climate change (ice cores, tree rings, pollen and historical records), the natural causes of climate change (orbital changes, sunspots, volcanic activity), and the contribution and consequences of recent human-induced (anthropogenic) warming.
A focused answer on Key Idea 5.1 for WJEC GCSE Geography Unit 2: climate change during the Quaternary, the evidence (ice cores, tree rings, pollen), the natural causes (orbital changes, sunspots, volcanoes), and the contribution and consequences of recent human-induced warming.
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What this dot point is asking
This dot point covers Key Idea 5.1 of WJEC Unit 2: climate change during the Quaternary period. You need the evidence for natural climate change (ice cores, tree rings, pollen, historical records), the natural causes (orbital changes, sunspots, volcanic activity), and the contribution and consequences of recent human-induced (anthropogenic) warming.
The Quaternary and the evidence
The natural causes of climate change
The greenhouse effect and human warming
Consequences of recent warming
Try this
Q1. What are Milankovitch cycles? [Knowledge recall]
- Cue. Slow, regular changes in the Earth's orbit and tilt that alter how much solar energy reaches the surface, helping to start and end ice ages during the Quaternary.
Q2. Explain how human activity has strengthened the greenhouse effect. [Short explanation]
- Cue. Burning fossil fuels, deforestation and farming release extra carbon dioxide and methane into the atmosphere; these greenhouse gases trap more outgoing heat, enhancing the natural greenhouse effect and warming the planet faster than natural causes alone.
Exam-style practice questions
Practice questions written in the style of WJEC exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
WJEC Unit 2 (Theme 5)4 marksDescribe the evidence used to show that climate has changed in the past.Show worked answer →
A short data-response describe question. Reward described sources of evidence.
Ice cores. Layers of ice trapped over thousands of years hold air bubbles, so scientists can measure past temperatures and greenhouse gases.
Tree rings and pollen. The width of tree rings shows warm or cool growing years, and preserved pollen shows which plants grew, and therefore the climate, at the time.
Top marks. Two or three clear sources, such as ice cores, tree rings, pollen and historical records.
WJEC Unit 2 (Theme 5)6 marksExplain the natural causes of climate change.Show worked answer →
A short explain question (levels marking). Reward developed natural causes, linked to a change in temperature.
Orbital changes. The Earth's orbit and tilt change in cycles (Milankovitch cycles), altering how much solar energy reaches the Earth and helping to start and end ice ages.
Sunspots and volcanoes. More sunspots mean the Sun gives out slightly more energy, warming the Earth; large volcanic eruptions throw ash and gas into the atmosphere that block sunlight and cause short-term cooling.
Top band. Link each natural cause to whether it warms or cools the planet, and note these are separate from recent human warming.
Related dot points
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A focused answer on Key Idea 5.2 for WJEC GCSE Geography Unit 2: weather and climate, the air masses and depressions and anticyclones that shape UK weather, and the causes, effects and management of weather hazards including UK storms and tropical storms.
- Key Idea 5.3: processes and interactions within ecosystems, the components of an ecosystem (biotic and abiotic), the flow of energy through food chains, food webs and trophic levels, the cycling of nutrients, and the global distribution and characteristics of major biomes.
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- Key Idea 8.1 (Theme 8): consumerism and its impact on the environment, the growth of consumerism and the rising demand for resources and energy, the ecological footprint, and the environmental impacts including pollution, waste, resource depletion and climate change.
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- Key Idea 4.1 (Theme 4): vulnerable coastlines, the physical and human factors that make a coast vulnerable to erosion and flooding, the threat of coastal erosion and retreat (for example soft cliffs), and the increasing risk of coastal flooding from storm surges and sea-level rise.
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Sources & how we know this
- WJEC GCSE Geography (Wales) specification (3110) — WJEC (2019)