Question

1. true or false: sometimes older rocks end up on top of younger rocks. a. true b. false 8. using a substances rate of decay to determine its age is an example of a. relative dating. b. using index fossils. c. chemical engineering. d. absolute dating. 9. what happened during the cambrian explosion? a. dinosaurs went extinct. b. many animals first appeared. c. single - celled life first appeared. d. humans first appeared. 10. which of the following rock layers contains the youngest fossils?

Explanation:

1. Question 7: Through geological processes like thrust - faulting and folding, older rocks can be pushed on top of younger rocks. So the statement is true.
2. Question 8: Using a substance's rate of decay (such as radioactive decay) to determine its age is absolute dating. Relative dating is about the order of rock layers without specific age values. Using index fossils is a form of relative dating. Chemical engineering is unrelated here.
3. Question 9: The Cambrian explosion was a period when many diverse animal species first appeared. Dinosaurs went extinct long after the Cambrian. Single - celled life appeared much earlier. Humans appeared much later in Earth's history.
4. Question 10: In undisturbed rock layers, the youngest fossils are in the top - most layer.

Answer:

1. A. True
2. D. absolute dating
3. B. Many animals first appeared
4. A (assuming A is the top - most layer in the image)