C. They study true movement of earthquake waves
Answer:
The answer is movement toward or away from Earth.
In astronomy, it is said that the Doppler effect tells Astronomers whether a star, or galaxy, is approaching or going away from us. It turns out the farther a galaxy is away, the faster it gets away from us - meaning that the Universe is expanding.
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Answer:
A stem and leaf diagram has two parts, the 'stem' and the 'leaf'. In the stem, there are numbers in ascending order from top to bottom. In the leaf, there are numbers showing the next digit of the number in the stem. The leaf is to the right of the stem.
The function of a stem and leaf diagram is to summarize data in a way that separates numbers into different number categories.
