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A rainbow
becomes more converging
Air is a gas silly ;)
Light passes thru, gets absorbed or is reflected dependent on the wavelength of light and the density of the plasma.
it changes in velocity
When fast water passes it leave
sh@@ happens
nothing happens
what happens to interstellear gas as it passes through a spiral density wave
It rotates.
the food passes through
time passes
It passes to the deceased's estate upon proof of death.
It turns red
an eclipse
It begins to melt.
They are eroded by the weather.