There must be equal amounts of mass on both side of the center of mass of an object. true or false

False but if we see the distribution of mass on earth crust.

Explanation:

When we take earth crust in the view it is not necessary to have equal amount of masses on the both sides of the earth crust. We can see ocean which are made up of basaltic rocks(heavier) are not evenly distributed. Ocean and continental plates are made up of different types of material and oceanic floor is heavier than continental floor(made up of granitic rocks).

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.