Question

use the diagram to answer the question. what is the relative age of the rocks in the intrusion marked by x? a. the rocks at x are the oldest. b. the rocks at x are the youngest. c. the rocks at x are older than layer 4 but younger than layer 3. d. the rocks at x are older than layer 2 but younger than layer 1. e. the rocks at x are older than layer 3 but younger than layer 2.

Explanation:

Step1: Recall principle of cross - cutting relationships

In geology, an intrusion is younger than the rocks it cuts through.

Step2: Analyze the diagram

The intrusion marked by X cuts through layers 1, 2, 3, and 4. So it is younger than all of these layers.

Answer:

B. The rocks at X are the youngest.