Final answer:
The density of the wood is 0.85 g/cm³.
Step-by-step explanation:
The density of an object is defined as the mass of the object divided by its volume. In this case, the mass of a 1000 cm³ piece of wood is measured to be 850g. To find the density, we need to divide the mass (850g) by the volume (1000 cm³).
So the density of the wood is 0.85 g/cm³.