Why is the sky blue at midday? -There is a large amount of water in the air and water is blue, so the sky is blue. -Interstellar dust particles interacting in the upper atmosphere cause a cascade of red, green, and blue light, but only the blue light is bright enough to reach the Earth's surface. -Light is scattered from molecules in the sky. The molecules resonate most strongly at higher frequencies/lower wavelengths, so the greatest intensity of scattered light is at the blue end of the spectrum. -Light is scattered from molecules in the sky but only the blue light reaches the Earth's surface

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Shock Waves

Shock waves are common in continuum mechanics, and their dominance is attributable to the fact that they are stronger (or even less) compressible. Substantial perturbations propagated as sudden dynamic changes of a compressible medium supersonically. Shock waves are all around us in our daily lives. Lightning, earthquakes, volcanic eruptions, and meteorite impact all produce them in nature. Even the earth, which is protected by its magnetic field, generates a shock wave as in solar wind that travels around 20 Earth radiuses. These shock waves might be either constant, linked to the body, or unsteady, i.e., moving around with time. All of the shocks mentioned above can be damaging, so precautions must be taken to reduce their impact.