(25) NASA. http://earthobservatory.nasa.gov/Newsroom/NewImages/images.
php3?img_id=17283San Francisco Mountain and surrounding areas. Public Domain.
(26) http://en.wikipedia.org/wiki/Mariana_trenchMariana Trench in the Pacific
Ocean. GNU Free Documentation.
(27) http://rst.gsfc.nasa.gov/Sect2/Sect2_1a.html. Public Domain.
(28) http://www.weather.gov/sat_tab.php?image=ir;http://stargazers.gsfc.
nasa.gov/images/sun_images/astronamers_electromag/elnino.gif
http://stargazers.gsfc.nasa.gov/students/how_astronomers.htm
http://veimages.gsfc.nasa.gov/274/MODIS1000058_md.jpg
http://visibleearth.nasa.gov/view_rec.php?id=274. Public Domain, Public
Domain, Public Domain.
(29) http://www.nasa.gov/centers/goddard/news/topstory/2005/earthweek.html.
Public Domain.
(30) http://pajk.arh.noaa.gov/sat.php. Public Domain.
(31) http://nationalatlas.gov/printable/images/pdf/reference/pagegen_fl.pdf.
Public Domain.
(32) Peter W. Sloss. http://www.magazine.noaa.gov/stories/mag26.htm. Public
Domain.
(33) http://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/GEO_Globe.jpg/
519px-GEO_Globe.jpg. GNU-FDL.
(34) http://upload.wikimedia.org/wikipedia/commons/8/82/Ardf_map.png.
GNU-FDL.
(35) http://www.nhc.noaa.gov/HAW2/english/history_printer.shtmlhttp://
celebrating200years.noaa.gov/magazine/devast_hurricane/image3_650.jpg
http:
//celebrating200years.noaa.gov/magazine/devast_hurricane/image3.html.
Public Domain.
(36) http://en.wikipedia.org/wiki/Image:Usgs_map_azimuthal_equidistant.PNG.
Public Domain.
(37) NOAA.
http://celebrating200years.noaa.gov/new_york_charts/compass_rose.html.
Public Domain.
(38) Craig Freudenrich.. CC-BY-SA.