Organic or inorganic impurity

Exercise and reference answers

Upper category

Organic

Lower category

Inorganic

Items

1. Category

   Organic

   Item

   Faeces

2. Category

   Organic

   Item

   Urea

3. Category

   Organic

   Item

   Peels

4. Category

   Organic

   Item

   Herbicides

5. Category

   Inorganic

   Item

   Nitrates

6. Category

   Inorganic

   Item

   Phosphates

7. Category

   Inorganic

   Item

   Metals

8. Category

   Inorganic

   Item

   Nitrogen

Instructions

Send each sewage impurity to the organic track or the inorganic track.

Explanation