Kids Riddles

Question: A man walks all the way around the world without getting wet.

How does he do this?

Question: A man and his boss have the same parents, but are not siblings. How is this possible?

Question: What jumps higher than a building?

Question: What loses its head in the morning and gets it back at night?

Question: My shallow hills are the faces of kings.
My horizon is always near.
My music sends men to the grave.
My absence sends men to work.

What am I?