The total volume of readily available global groundwater is about 4.2 x 106 km3
Groundwater makes up about twenty percent of the world's fresh water supply, which is about 0.61% of the entire world's water, including oceans and permanent ice.
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It is estimated that there is about 22.6 million cubic kilometers of water stored in the Earth's groundwater reservoirs.
To convert 30,000,000 cubic kilometers to cubic miles, you can use the conversion factor: 1 cubic kilometer is equal to approximately 0.239913 cubic miles. Therefore, 30,000,000 cubic kilometers is equal to approximately 7,197,390 cubic miles.
The Gulf of Mexico has an estimated volume of around 2.5 million cubic kilometers of water, which is equivalent to 2.5 x 10^15 cubic meters.
0.7 cubic miles is equivalent to approximately 2.91876 cubic kilometers. To convert this volume to meters, you would need to multiply by 1,000 to get 2,918,760,000 cubic meters.
According to the U.S. Geological Survey, there is over 1,4 billion cubic kilometers of water on the planet. 95% of that water is in the oceans, so that makes 1,3 billion cubic kilometers of ocean water.
You can take any linear measure and cube it. There is no theoretical limit to how big your units can be, for example, cubic meters, cubic kilometers, cubic light-years, cubic megaparsecs, cubic gigaparsecs... whatever you wish.