To irrigate crops
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Water. Not clean or pure or fresh water, but ALL water.
It's actually 75 percent water.
Water molecules
The answer depends on the context: Do you want: frozen water as a percentage of all water on earth? frozen water as a percentage of all matter on earth? frozen water as a percentage of all water in the solar system, or beyond? frozen water as a percentage of all matter in the solar system, or beyond? There are other possible interpretations.
The aqueducts. They were the first sewer and water system in the world. They brought in clean water over hundreds of miles from fresh water lakes or rivers so Romans could bath in and drink with fresh water. There are many aqueduct ruins all throughout southern France (like Aix-en Provence) and Italy as well.The arch, used in architecture.The Romans, at the height of their power, had an extensive highway system that connected the desert of Egypt and Palestine to the cold, snow-covered forests of Germania and Northern Europe. Because of the size and length of these roads, the Roman legions could be easily travel from one width of the Empire to the other.