Stock resource evaluation: measured reserves, indicated reserves, inferred resources, possible resources
Geographers classify stock resources by how confidently we can extract them. Categories range from fully proven reserves to highly uncertain possible resources.
Real World
BP's North Sea oil fields contain measured reserves confirmed by decades of drilling. Prospective deepwater fields off the Falkland Islands remain only inferred resources — geology suggests oil exists, but costly extraction makes commercial viability uncertain.
Exam Focus
Order the four categories from most to least certain in answers; examiners reward correct sequencing, not just naming.
Essay Framework
Use PEEL to structure every paragraph. Tap each step for guidance and an example.
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