Where are the oldest pictures, by year, going to be in your stack? Often igneous intrusions will cut across layers of rock.
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If you did it like many people, you based your sentences on what you know normally happens when you make a lunch.
This is similar to what geologists do to determine age.
This matching process is called correlation, which has been an important process in constructing geological timescales.
Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.
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