Table 1 shows the mean rate of decomposition for different types of garden waste in a school composting experiment.
| Type of organic waste | Mean rate of decomposition (g/week\text{g/week}g/week) |
|---|---|
| Pine needles | 0.15 |
| Birch leaves | 1.20 |
| Clover leaves | 3.80 |
| Grass clippings | 5.50 |
Which material would take the least time to completely turn into compost?
Pine needles
Birch leaves
Clover leaves
Grass clippings
