Answer:
An oasis can be formed by an underground aquifer or river that creates enough pressure for water to seep to the surface, forming the oasis. These aquifers and natural springs allow for life to exist in harsh climates like the desert and are often well known to local herders, farmers, and travelers in the region.
English sea explorer, Henry Hudson.
President Jefferson had doubts because he was unsure if the purchase of land without the agreement of the legislative branch was constitutional
