(24) http://en.wikipedia.org/wiki/Image:Haboob2.jpg. GNU-FDL.
(25) http://en.wikipedia.org/wiki/Image:
Air_pressure_crushing_a_plastic_bottle_p1180559.jpg. GNU-FDL.
(26) http://en.wikipedia.org/wiki/Image:Seasonearth.png. GNU-FDL.
(27) http://en.wikipedia.org/wiki/Image:Wavelength.svg. GNU-FDL.
