Sunlight interacting with the Earth's atmosphere makes the sky blue. In outer space the astronauts see blackness because outer space has no atmosphere.
<span>Sunlight consists of light waves of varying wavelengths, each of which is seen as a different color. The minute particles of matter and molecules of air in the atmosphere intercept and scatter the white light of the sun. A larger portion of the blue color in white light is scattered, more so than any other color because the blue wavelengths are the shortest. </span><span>When the size of atmospheric particles are smaller than the wavelengths of the colors, selective scattering occurs-the particles only scatter one color and the atmosphere will appear to be that color. Blue wavelengths especially are affected, bouncing off the air particles to become visible.</span><span>This is why the sun looks yellow from Earth (yellow equals white minus blue). In space, the sun appears white because there is nothing in between to scatter its white light. </span><span>At sunset, the sky changes color because as the sun drops to the horizon, sunlight has more atmosphere to pass through and loses more of its blue wavelengths. The orange and red, having the longer wavelengths and making up more of sunlight at this distance, are most likely to be scattered by the air particles. </span><span>The scattering of visible light by atmospheric gases is most correctly called the </span>Tyndall effect<span>, but it is more commonly known to physicists as </span>Rayleigh scattering<span> after Lord Rayleigh, who studied it in more detail a few years later. Rayleigh Scattering is where red, orange, yellow, and green are passed through and blue, indigo, and violet are "scattered" out creating the color.</span><span>Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue. </span>
<span>It was letter d.
Thoreau was a pacifist but he also advocated the use of force when necessary. Thoreau believed that there comes a time that
you have to use aggressive means to achieve change against an unjust system
although Lewis was against violence particularly that of Malcolm X exultations,
this call of violence is similar to Thoreau.</span>
The name of that American Educator is <span>W.E.B. Du Bois
</span><span>W.E.B. Du Bois Was a really well known educator figure that often became a dominant voice for the Minorities' civil rights in United States.
Because he felt that minorities often faced discrimination and racism towards in the workplace and educational institution, He established NAACP (</span> <span>National Association for the Advancement of Colored People) in 1909, which initially made to provide education and job agencies for people of color.</span>
I just took the test and the answer to this question is B: Europe after the Norman Conquest
I honestly dont understand this question. Sorry I will try to figure it out for you.
