The Caravel of the vessels made the European voyages of the 15th and 16th centuries possible because it allowed the ships to sail against the wind
We use altitude and azimuth to describe the location of an object in the sky as viewed from a particular location at a particular time.
Aquifers or "water tunnels" could bring water via underground.
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Answer:
It helped to guard the secret location of their gold mines.
Explanation: