I'd post them anyway.

of air around the mountain makes a great picyure.


pattern by the wind above them.

Above, an F/A-18 Hornet was photographed just as it broke
the sound barrier.
Explanation: Many people have heard a sonic boom, but few have
seen one. When an airplane travels at a speed faster than sound,
density waves of sound emitted by the plane cannot precede the
plane, and so accumulate in a cone behind the plane.
When this shock wave passes, a listener hears all at once the sound
emitted over a longer period: a sonic boom. As a plane accelerates
to just break the sound barrier, however, an unusual cloud might
form. The origin of this cloud is still debated.
A leading theory is that a drop in air pressure at the plane
described by the Prandtl-Glauert Singularity occurs so that moist
air condenses there to form water droplets.
Yeah, that's exactly what I was going to say!!!
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