Answer:
The idea that the oldest rock will always be the bottom layer of a series of rock layers is called the principle of superposition.
Explanation:
According to the law or principle of superposition, the sequence of layers of sedimentary rock go from the oldest, at the bottom, to the youngest, at the top. Sedimentary rock is formed when pieces of rock and even of living organisms - once they die, of course - are deposited on a surface. As time passes, new pieces are deposited on top of the older pieces. That process happens again and again until we have different layers of sedimentary rock, the first one being the oldest, that is, the one that was first deposited there.
The author uses a historical text. It is a written document that allows obtain a more completed, diversified and meaningful knowledge of history. A historical text is a written document that can provide us, after its interpretation, knowledge about the human past. The object of commenting on a historical text is to approach the understanding of a historical epoch based on the elements provided by the text. Hence the importance of placing the document in its context. It is necessary to unravel what its author or authors have said, how they have said it, when, why and where, always relating it to its historical moment. They are based on reality, generally their structure is narrative and descriptive; usually they are written chronologically and reflect experiences.
Explanation:
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