I'm working on my letter of motivation for Utrecht University's Meteorology, Physical Oceanography, and Climate program. They request the following information in their letter of motivation - "In your letter, address the following questions: Why do you want to study at Utrecht University? Which subjects and subject areas are you most interested in and why? Do you have pertinent work experience and interests? What career do you want after you graduate? Does your educational background match the programme?"
Hope this helps a bit...
Good luck!