Why did europeans explore africa, asia and the americas beginning in the 1400's

At first, the Europeans were looking for a new way to get to India to trade, so they didn't have to take the silk road, but they found the Americas instead of India.  They started to colonize more and more lands, because they realized that each land had a valuable resources that the Europeans could trade and use to make more money, therefore making them a more powerful country.  

ok, so basically your gonna start with 350 ok. so there's 60 seconds in a minute so that means you he can go up 10 ft per minute. soo, after 3 minutes he should be at 260 ft after three minutes : )

sonar maybe? ? i dont know the choices