Question

mod 7 lesson 1 exercises
the ____________ forms a natural border between the united states and canada.
○ canadian shield
○ st lawrence river

Explanation:

The St Lawrence River is a significant waterway that serves as a natural border between the United States and Canada. The Canadian Shield is a large geological area but not a border - forming feature between the two countries in the context of a natural border like a river.

Answer:

St Lawrence River