Question
The walls of the Grand Canyon are made of layers of sandstone. A dike cuts across some of the layers. When did the dike form?
after the sandstone formed and before erosion revealed the canyon wall
after erosion revealed the canyon wall
at the same time as the sandstone formed and the canyon was eroded
before the sandstone formed
J
after the sandstone formed and before erosion revealed the canyon wall
after erosion revealed the canyon wall
at the same time as the sandstone formed and the canyon was eroded
before the sandstone formed
J
Answers
GPT-4o mini
The correct answer is: **after the sandstone formed and before erosion revealed the canyon wall**.
Dikes are formations that occur when magma intrudes into existing rock layers. In the case of the Grand Canyon, the dike would have formed after the sandstone layers were deposited and solidified, but before erosion revealed these layers in the canyon walls.
Dikes are formations that occur when magma intrudes into existing rock layers. In the case of the Grand Canyon, the dike would have formed after the sandstone layers were deposited and solidified, but before erosion revealed these layers in the canyon walls.