Answer:
compass, ship sailing,speculating by use of maps where one could possibly go to at least explore the unseen, and literature currently written about others travels in new or unknown , areas. once read about the area could conceptually be explored the thing is tools needed compass , and navigation knowledge.
Grain is used to feed cattle and livestock because it is healthy, cheap, ethical, and easy to grow in some American climates. Grain is the easiest and most cost-efficient way to feed livestock.