Volume of a tree - Lycée Bellevue (Alès) Lycée Val de Durance (Pertuis), Colegiul National Mihail Eminescu (Satu Mare - Roumanie), Colegiul National Emil Racovita (Cluj - Roumanie)

Be able to measure the volume of a tree and its ''density''.
[Note : The density is to be defined. For instance the quantity of CO2 that it can absorb, the largest surface area of its shade, the volume of the leaves (green part) compared to the total volume].