(04.03 MC) North America physical map showing the following elevations, sea level to 649 feet, 650 to 1,649 feet, 1650 to 3249 feet, 3250 to 6549 feet, and 6500 feet and higher. The east coast and much of the South, up through the lower Mississippi River valley, is sea level to 649 feet. The upper Mississippi River and Ohio River valleys are 650 to 1649 feet. The Appalachian Mountains are 650 to 3249 feet. Moving west from the Mississippi, elevation steadily rises to the Rocky Mountains, from 3250 to 6500 feet. The elevation remains largely at 1650 feet and higher west of the Rockies, with a sharp drop at the Pacific Ocean.

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What can you infer about what Lewis and Clark saw as they moved west from the Mississippi River? (5 points)

a
The land on the east coast was more fertile than the land in the west.

b
The landscape rose sharply and then flattened as they went farther west.

c
The Mississippi River was higher than the mountains in the east.

d
The mountains in the west were taller than the mountains in the east.