Question

relative and absolute ages of rocks
directions: use the diagram below to answer the following questions.

1. is unconformity a older or younger than p?
2. is unconformity b older or younger than k?
3. is the tilting/folding of the bottom layers younger or older than p?
4. what letter represents the intrusion?
5. put the rock layers and events into order from the oldest to the youngest. include the \tilting/folding\ of the bottom layers.

directions: use the diagram below to answer the questions.

1. indicate the number that represents the following features.

intrusion
fault
unconformity

1. which is older, the fault or the unconformity?
2. which is older, the intrusion or the unconformity?
3. define \unconformity.\

Explanation:

Step1: Understand the principle of superposition and cross - cutting relationships

In geology, younger features cut across older ones. Unconformities are surfaces where there is a gap in the geological record.

Step2: Answer question 1

Unconformity A cuts across layer P. So, unconformity A is younger than P.

Step3: Answer question 2

Unconformity B is below layer K. Layer K was deposited on top of unconformity B. So, unconformity B is older than K.

Step4: Answer question 3

The tilting/folding of the bottom layers is cut by layer P. So, the tilting/folding of the bottom layers is older than P.

Step5: Answer question 4

An intrusion is a body of igneous rock that forms within pre - existing rock. In the first diagram, M represents the intrusion as it cuts across other rock layers.

Step6: Answer question 5

The oldest to youngest order: Tilting/folding of bottom layers, O, N, M, P, Q, unconformity A, L, H, I, unconformity B, K.

Step7: Answer question 6

(Assuming the second diagram has numbered features which are not visible in the text clearly. But if we assume a typical case where intrusion is an igneous body cutting across layers, fault is a fracture with displacement and unconformity is a gap in the record) If we assume features are numbered 1 - 5, intrusion might be 3, fault might be 4, unconformity might be 2 (this is highly dependent on the actual numbered features in the diagram).

Step8: Answer question 7

The fault cuts across the layers that are affected by the unconformity. So, the unconformity is older.

Step9: Answer question 8

The intrusion cuts across the layers that are affected by the unconformity. So, the unconformity is older.

Step10: Answer question 9

An unconformity is a surface of erosion or non - deposition that represents a gap in the geological record, separating younger and older rock layers that are not continuous in time or sequence.

Answer:

1. Younger
2. Older
3. Older
4. M
5. Tilting/folding of bottom layers, O, N, M, P, Q, unconformity A, L, H, I, unconformity B, K
6. (Answers depend on actual diagram numbering. Example: 3, 4, 2)
7. Unconformity
8. Unconformity
9. A surface of erosion or non - deposition that represents a gap in the geological record, separating younger and older rock layers that are not continuous in time or sequence.