Environmental Systems, Feedback & Risk — Drills · Grade 12 Science
Chapter: Conservation, Systems & Environmental DesignWhat these drills covers
By the end of Environmental Systems, Feedback & Risk you should be able to:
- I can balance reservoir inputs, outputs, and storage change.
- I can distinguish feedback signs, hazards, exposure, and risk assumptions.
2 questions, numeric and written answer, each with a worked explanation.
Vocabulary used: reservoir, feedback, exposure.
Problem 1
Reservoir 600 units,outflow 30 units/year. Estimate residence time.
Hints
Write the relationship first; substitute with consistent units.
Answer and explanation
20 years
600/30=20.
Problem 2
Is positive feedback necessarily desirable?
Answer and explanation
No; positive means amplifying, not good.
Response criteria
- State a scientifically accurate conclusion.
- Show the calculation or mechanism that supports it.
- Include units, conditions, or limits where relevant.