Throughout the reflection, make sure you have a copy of the Student Guide and your data tables. Complete the paragraph by using the drop-down menus. In this lab, you determined the relative ages of rock layers using the principles of relative dating. The says that a rock layer found closer to Earth’s surface is a rock layer that is deeper in Earth’s surface. The states that intrusions are the rock layer they cut across. You also determined the absolute ages of rock layers using a . The data you gathered helped you identify an unknown fossil.

Throughout the reflection, make sure you have a copy of the Student Guide and your data tables. Complete the paragraph by using the drop-down menus.

In this lab, you determined the relative ages of rock layers using the principles of relative dating. The  

✔ law of superposition

says that a rock layer found closer to Earth’s surface is  

✔ younger than

a rock layer that is deeper in Earth’s surface. The  

✔ principle of cross-cutting relationships

states that intrusions are  

✔ younger than

the rock layer they cut across. You also determined the absolute ages of rock layers using a  

✔ mass spectrometer

. The data you gathered helped you identify an unknown fossil.

Explanation:

the checked ones are the right answers

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