They are both major US cities
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They might have located these two rooms inside the Great Pyramid of Giza.
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The Crusades let to an increased demand for goods from Asia (answer C). This was due to the European soldiers traveling East and bringing back with them Asian goods such as silk, porcelain, and most importantly, spices.
Food and water source for the people
Nutrients for the soil and agriculture
Cataracts provided natural protection from enemies
A source of travel
