Which statement describes a surface wave?
a surface wave is a type of electromagnetic wave.
a surface wave is a wave that travels through space.
a surface wave is a wave that moves along the interface of two different materials, like air and water.

The statement which best describes a surface wave is: C. A surface wave is a wave that moves along the interface of two different materials, like air and water.

A wave can be defined as a disturbance in a medium that progressively transports energy from its source to another location, without the transportation of matter.

In Science (Physics), there are two main (2) types of wave and these are:

A surface wave can be defined as a mechanical wave that moves or propagates between the interface of two different materials such as water and air.

This ultimately implies that, a surface wave is a wave that wave that moves or propagates along the interface of two differing media.

For example, gravity waves that moves or propagates along the surface of water is a surface wave.

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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.

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.