Environmental science · Grades 7–11
Environmental systems and trade-offs · Revision sheet
Compare outcomes with a clear boundary and common unit.
Learn the idea
System
Define the area, time and processes included in a comparison.
Trade-off
An option can improve one outcome while worsening another.
Unit
Compare like functions, such as impact per use rather than unlike totals.
Evidence
A label is not a substitute for measured data and stated assumptions.
Explain without looking
- Which statement is appropriately limited?
- Why should uncertainty be reported in an environmental estimate?
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.