If the earth isn't too rocky or hard-compacted, it should not be too much
of a challenge to complete that job in about 1/2 hour = 0.0625 man-day.
From one upwards
12L
A cubic meter of dry earth typically weighs between 1.5 to 1.8 metric tons, depending on the composition of the soil and its moisture content.
13%
3
1 meter = 10 decimeter 1 cubic meter = 1000 cubic decimeter
0.2
10
26 bags
Pressure can't be determined from volume alone. You need more info like temperature, gas amount, or system type (gas, liquid, compression).
Kilogram per cubic meter is the one that doesn't belong. Square meter is meter^2 and cubic meter is meter^3 but kilogram per cubic meter is a density
A cubic metre of gas on earth will not have a mass of 1 kg.