Chapter 12

Page 133

Questions 1-6 Answers

1. a. What types of rock make up the platform on which most of the rest of Canada is built?

Igneous & Metamorphic

b. What is the topography of the Shield like?

Many lakes, exposed bedrock, rounded hills

c. What geological processes created this topography?

Glaciation & Erosion

2. Why is the Canadian Shield also referred to as the Precambrian Shield?

It was formed during the Precambrian Era

3. a) Why is the Shield called Canada’s storehouse of metallic minerals?

Many minerals are found in the shield eg. Lead, gold, nickel, copper, & zinc.

b) How do mineral deposits form?

Magma containing dissolved minerals intruded into existing rock.

c) Why are nickel and copper often found together?

Both nickel & copper have similar densities

4. Describe the effects of glaciers on the following:

a) the land’s surface material, such as soil, rocks, and gravel

this dammed the rivers

b) the drainage of the Shield

Disorganized drainage pattern

5. The natural beauty, the minerals, the rivers, and the forests, and the economic backbone of the Shield. How have these

resources aided in the economic development of this region?

Mining companies, rivers/forests bring tourists

6. Answers will vary