Question

What makes Arctic Terns fly from one end of the Earth to the other?

the subject is actually science.

Answer 1

Arctic terns migrate to follow the summer sun. Seasons happen because Earth is tilted on its axis while it revolves around the sun. During winter, the Northern Hemisphere is tilted away from the sun's warming rays. This is why it's colder during the winter in places north of the Equator, like the United States