INTRO TO PHYSICAL GEOL STAND ALONE
INTRO TO PHYSICAL GEOL STAND ALONE
12th Edition
ISBN: 9781323423950
Author: Tarbuck
Publisher: PEARSON
Question
Chapter 23, Problem 1GST
To determine

The reason for the increase of igneous rocks to stand high above the terrain and the term which applies to this situation.

Expert Solution & Answer
Check Mark

Answer to Problem 1GST

Due to differential weathering, sedimentary rocks eroded much earlier than the igneous rocks, allowing the deeply buried igneous rocks to stand high above the terrain.

Explanation of Solution

The given photo indicates a landmark known as Shiprock, in the northwestern corner of New Mexico. It consists of a mass of igneous rock that is formed as a result of underground plumbing of a volcano, which is now extinct. At the upper left corner, it consists of an igneous wall-like structure which is known as a dike. These igneous features are surrounded by sedimentary rocks.

The deeply buried rocks are igneous rocks, whereas the surrounding terrain is composed of sedimentary rocks. The igneous rocks are more resistant to weathering than the sedimentary rocks. Hence, they erode at higher rates than the igneous rocks. This phenomenon is known as differential weathering.

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