A scientist wants to test how much of an acid can be added to a solution before the pH of the solution changes to below a certain point. The starting
pH of the solution is 6.0, and the scientist wants to know when the pH of the
solution changes to below 4.0,
Which pH indicator should the scientist use?

high growth (apex)

1. law of superposition: when there are horizontal layers of rock. the layers at the top are the youngest.

2. law of uncomformity: where one layer is much younger than the previous one, therefore creating a gap in the time record.

3. inclusion: when there is a solid stone inside of another.

4. intrusion: a feature formed when a stone is filled with magma.

hope i answered your question.