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Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536

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BuyFindarrow_forward

Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536
Textbook Problem

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FIGURE 10.33 Map of North America showing the continental shield (Canadian shield) and the general ages of rocks.

Going outward from the shield to the coast, what generally happens to the ages of rocks?

To determine

The ages of rocks by going outward from the shield to the coast.

Explanation

Figure 10.33 illustrates the Map of North America showing the continental shield (Canadian shield) and the general ages of rocks.

The origin of continents is still under debate. As a fact, the continents tend to have a core region composed of very ancient igneous and metamorphic rocks that are inferred to signify the deeply eroded roots of prehistoric mountains.

These core regions are worn out by erosion to form relatively low relief areas that took place for hundreds of millions of years that are placed far from the active plate tectonic boundaries.  Consequently, these areas have a history of tectonic stability over a vast period of time. These ancient crystalline rock regions are known as continental shields...

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