Answer:
principle of superposition
Explanation:
Principle of superposition -
According to the principle of superposition , the positioning of the layer are in a manner that , the youngest layer is near to the surface of the crust , where as the oldest layer is deep inside from the surface of the crust , is referred to as principle of superposition .
This method enables to determine the age of the layers according to their placement from the crust .
Hence , from the given information of the question ,
The correct answer is principle of superposition .
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Answer:
When we talk about the <u>visible electromagnetic spectrum</u>, we know it starts in <u>violet-blue</u> and ends in <u>red</u>.
In this context the astronomer <u>Edwin Powell Hubble </u>observed several celestial bodies, and when obtaining the spectra of distant galaxies he observed that the spectral lines were displaced towards the red one (red shift), whereas the nearby stars showed a spectrum displaced to the blue one.
From there, it was deduced that the farther a body in the universe is, the more redshifted it is in its spectrum. This effect is due to the dilation and contraction of time by speed according to the relativity.
Now, the Sun is a massive star and the Earth is at certaind distance from it, therefore <u>time passes slower in the Sun than on Earth</u>. This causes the spectrum of the Sun to present lines with a lower frequency or longer wavelength than normal, that is, more towards red.
