2.4 The Earth's essential resources: How can we preserve the planet for future generations?
Evaluate resource use, water treatment, separation, atmospheric change and greenhouse-gas evidence.
How to study WJEC GCSE The Sciences
Move from a scientific model to a prediction or method, collect or interpret evidence, show quantitative working and finish with a conclusion whose limits match the data.
Core concepts
Concept 1
Distinguish finite and renewable resources and evaluate sustainability.
Exam cue: Identify the unit, entered tier, supplied reference material, command word and relevant scientific enquiry skill.
Concept 2
Select separation and treatment methods for mixtures and water supplies.
Exam cue: Match each separation stage to a physical property and distinguish evidence from a policy judgement.
Concept 3
Interpret atmospheric and climate data and evaluate greenhouse-gas decisions.
Exam cue: Use scientific terminology, show quantitative working with units, and connect conclusions to data and the stated model.
Concept 4
Official subtopics: 2.4.1 The Earth's resources; 2.4.2 Sustainable water supply; 2.4.3 Separation techniques involving water; 2.4.4 The composition of the atmosphere; 2.4.5 Greenhouse gases and climate change.
Concept 5
Scientific enquiry and mathematical skills apply in this topic; bold amplification is Higher Tier only.
Risk pitfalls and guardrails
Treating filtration as if it removes dissolved substances or assuming correlation alone proves causation.
Guardrail: Do not import outgoing 3430QD content, another science route, a fixed required-practical list or unsupported tier and connection assumptions.
Recalling a fact without applying it to the observation, data, practical method or unfamiliar context.
Guardrail: Use the live secure pack: Task A may use groups of up to three; Task B is individual and highly controlled. Two enquiries are selected by the centre from three.
Importing content, required practicals, tier rules or paper structure from the outgoing WJEC or another awarding-body route.
Guardrail: Bold amplification is Higher-only. Units 1-6 may mix tiers, but Unit 7 is untiered.
Memory anchors
Finite resource
A resource used faster than it is naturally replaced.
Potable water
Water safe to drink, not necessarily chemically pure.
Filtration
Separation of an insoluble solid from a fluid using a barrier.
Distillation
Separation using differences in boiling point and condensation.
Greenhouse gas
An atmospheric gas that absorbs and re-emits infrared radiation.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A treatment plant labels its output water potable. What does that guarantee? Judge the resource or separation claim using sustainability and the evidence supplied. Treat every stated unit as part of the evidence.
Which sequence is commonly used to make fresh water potable? Judge the resource or separation claim using sustainability and the evidence supplied. Base the comparison on like-for-like evidence.
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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