The one that differentiates Christopher columbus from Bartolomeu Dias is : Columbus planned to reach Asia by sailing west across Atlantic Ocean, while Dias hope to reach Asia by sailing around Africa and through the Indian Ocean.
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Because they knew they could do more and they would work because they knew they were getting money
They needed financial help
Advances in technology in the European Age of Exploration made possible for explorers to travel across the sea. Two examples of the many innovations could be the <em>Caravel</em>, a small to medium sized ship that was mostly used for fishing and exploring since it was fast and easy to maneuver, and the <em>Magnetic Compass</em> that helped explorers know what direction they were headed so they could reach their destination.