Its 12.000
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2.5cm is the most precise measurement of the two measurements.
A millilitre is more precise.A millilitre is more precise.A millilitre is more precise.A millilitre is more precise.
Assuming that they are all in the same measurement units, it is 32.45
cm most likely if you want to be precise. but meters if you are making an estimate.
It depends on the size and mass of the rock. For a "normal" rock (as opposed to merely a stone) I suggest a crane with some means for measuring the rock's mass. A number of pulleys, each with a weighing machine should do the trick. Alternatively, you could use a weighbridge, if there is one in the vicinity. To obtain its volume, you probably need a 3-d laser-profiling device. That should give the most precise measurement of its volume.