• Credits

    Media Credits

    The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit. The Rights Holder for media is the person or group credited.

    Associate Producer

    Guerrilla Cartography

    Writer

    Diana Nelson, B.S. Education, M.S. Aeronautics, Master Teacher K-12

    Designer

    Cynthia Olson, Graphic Design and Creative Services

    Editors

    Julie Brown, National Geographic Society
    Elaine Larson, National Geographic Society

    Factchecker

    Cathlyn Matracia

    Funded by

    Lockheed Martin

  • User Permissions

    For information on user permissions, please read our Terms of Service. If you have questions about licensing content on this page, please contact ngimagecollection@natgeo.com for more information and to obtain a license. If you have questions about how to cite anything on our website in your project or classroom presentation, please contact your teacher. She or he will best know the preferred format. When you reach out to him or her, you will need the page title, URL, and the date you accessed the resource.

    Media

    If a media asset is downloadable, a download button appears in the corner of the media viewer. If no button appears, you cannot download or save the media.

    Text

    Text on this page is printable and can be used according to our Terms of Service.

    Interactives

    Any interactives on this page can only be played while you are visiting our website. You cannot download interactives.