Q: As per hutton's unconformity, what happened to the intermediate layers of rock?


Read this paragraph and choose the correct option from the provided answers:

Look at the rock layers pictured below ( Figure below ); they show a feature called Hutton’s unconformity. The unconformity was discovered by James Hutton in the 1700s. Hutton saw that the lower rock layers are very old. The upper layers are much younger. There are no layers in between the ancient and recent layers. Hutton thought that the intermediate rock layers eroded away before the more recent rock layers were deposited.

 Choices:

- they metamorphized

- they fused

- they expanded

- they eroded away


A:
they eroded away