Which statements about electric field lines are correct? check all that apply. they point toward a positive charge. they point toward a negative charge. they point away from a positive charge. they point away from a negative charge. they cross over one another between charges. they never cross.

The correct statements are "They point away from a positive charge" and "They never cross".

Explanation:

Electric field lines are the regions around the charged particle in which the electric force can be experienced.

The properties of the electric fields are as follows:

(1) The two electric field lines never cross each other. Otherwise, it will point to different direction at a point.

(2) The electric field is directed outward for the positive charge.

(3)The electric field is directed inward for the negative charge.

Therefore, the correct statements are "They point away from a positive charge" and "They never cross".

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.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.