Measuring in light-years also allows astronomers to determine how far back in time they are viewing , Because light takes time to travel to our eyes. Everything we view during the dark in night has already been happened.
Try taking a clearer picture or just type question 13c because i don't know what it is.
Answer:
The type of rock can tell you if the land was formed by layers of sediment, lava, etc. Fossils can show how old they are and therefore how old the land around it is
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