Assuming that the question is being asked about "dirt"; in the United States, the volume of dirt is calculated in cubic yards. In the rest of the world, the volume of dirt is calculated in cubic meters.
A cubic yard of dirt is the volume of dirt that fits in a space 1 yard (36 inches) by 1 yard by 1 yard.
A cubic meter is 1M X 1M X 1M.
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Yes, there are ground wire gauges. The approiate size ground wire must be matched to the size service you are installing. For instance a 200 amp serivce must be grounded with a # 4 bare copper ground wire.
# 10 bare copper.
Use #10 copper.
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
#6 bare copper wire.