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Chapter 11: Problem 1

What is a Precambrian shield? Where is one located in North America?

Short Answer

Expert verified
A Precambrian shield is a large area of exposed Precambrian-aged rocks, which are the oldest rocks on Earth (formed more than 541 million years ago) and form the stable, ancient geological cores of continents. In North America, the Canadian Shield (or Laurentian Plateau) is an example, spanning across eastern and central Canada and into the north-central United States.

Step by step solution

01

Define Precambrian shield

A Precambrian shield is a large area of exposed Precambrian-aged rocks, which are the oldest rocks on Earth (formed more than 541 million years ago). These shields are usually composed of igneous and metamorphic rocks, and they form the stable, ancient geological cores of continents.
02

Locate Precambrian shield in North America

One such Precambrian shield in North America is the Canadian Shield, also known as the Laurentian Plateau. It covers a vast area, stretching from eastern Canada (Labrador and Quebec) through central Canada (Ontario and Manitoba) and into the north-central United States (Minnesota and Wisconsin).

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