Misc: an animal epidemic is called an----------?

Questions

What metal makes up most of earth's centre copper, gold or iron?

What percentage of your weight is water 30, 50 or 70 percent?

What shape is a crystal of table salt a cube, oval or sphere?

What southern U S state capital is said to have been named for the Western & Atlantic Railroad?

What travels faster than light a laser beam, sound or nothing?