1. Analyze the first cross-section (1) using the principles of superposition, cross-cutting relationships, and inclusions.
- The layer labeled C is at the bottom, so it is the oldest.
- The layer labeled B is above C, so it is younger than C.
- The layer labeled A is above B, so it is younger than B.
- The intrusion (A) cuts through both B and C, indicating that A is younger than both B and C.
- The inclusion of C within A indicates that C is older than A.
- The cross-cutting relationship shows that A cuts through B and C, so A is younger than B and C.
- Therefore, the order from oldest to youngest is C, B, A.
2. Analyze the second cross-section (2) using the principles of superposition and baked contacts.
- The layers are stacked with C at the bottom, D in the middle, and A at the top.
- According to the law of superposition, the oldest layer is at the bottom, so C is the oldest.
- D is above C, so D is younger than C.
- A is above D, so A is younger than D.
- The baked contact indicates that the intrusion (B) is younger than the surrounding rock (A, D, C).
- The intrusion B cuts through A, D, and C, so B is younger than A, D, and C.
- Therefore, the order from oldest to youngest is C, D, A, B.
3. Analyze the third cross-section (3) using the principles of cross-cutting relationships and superposition.
- The layers are stacked with C at the bottom, E in the middle, D above E, and B at the top.
- According to the law of superposition, the oldest layer is at the bottom, so C is the oldest.
- E is above C, so E is younger than C.
- D is above E, so D is younger than E.
- B is above D, so B is younger than D.
- The intrusion (F) cuts through C, E, and D, indicating that F is younger than C, E, and D.
- The intrusion (F) is also younger than B because it cuts through B.
- Therefore, the order from oldest to youngest is C, E, D, B, F.
Final Answer:
1. Oldest to youngest: C, B, A
2. Oldest to youngest: C, D, A, B
3. Oldest to youngest: C, E, D, B, F
Parent Tip: Review the logic above to help your child master the concept of relative age dating worksheet.
