Question

1. why are there many lakes in the canadian shield region?

a. rainfall floods the land every year
b. melting mountains leave behind ponds
c. rivers overflow from nearby oceans
d. glaciers carved basins that later filled with water

Explanation:

To determine why there are many lakes in the Canadian Shield region, we analyze each option:

• Option A: Annual rainfall flooding is not the primary reason for the numerous lakes in the Canadian Shield. The region's lake formation is not due to regular, annual flooding from rain.
• Option B: There are no melting mountains in the Canadian Shield region that would leave behind ponds to form lakes. The landscape of the Canadian Shield is not characterized by mountain melting as a lake - forming process.
• Option C: Rivers overflowing from nearby oceans is incorrect. The Canadian Shield's lakes are not formed by ocean - related river overflow.
• Option D: The Canadian Shield was heavily glaciated during the last ice age. Glaciers moved across the landscape, carving out basins (depressions in the land). After the glaciers melted, these basins filled with water, forming the many lakes that are characteristic of the Canadian Shield region.

Answer:

D. Glaciers carved basins that later filled with water