1.what canadian landform covers about half of the country? a)the interior plains b) the canadian shield c) the st. lawrence lowlands d) the yukon territory 2.what are four major natural vegetation in the us and canada are tundra, grassland, desert scrub, and? (a) permafrost (b) forest (c) swamp (d) all of the above 3. why is mining important to the united states? (a)it employs many workers (b) gold is expensive (c) minerals are shipped to canada (d) industries use minerals. 4. what statement best describes manifest destiny meant to many americans during 1800s?