Question

Why weastern cordillera have steep slopes and high peak

Answer 1

Explanation:

West of the Great Plains the United States seems to become a craggy land whose skyline is rarely without mountains—totally different from the open plains and rounded hills of the East. On a map the alignment of the two main chains—the Rocky Mountains on the east, the Pacific ranges on the west—tempts one to assume a geologic and hence topographic homogeneity. Nothing could be farther from the truth, for each chain is divided into widely disparate sections.

Answer 2

Western cordilleras have steep slopes and high peaks

Explanation:

The North America cordilleras is a mountain chain along the western side of the American and covers an extensive area of the mountains ranges and tertiary mountain and plateaus in the western North America and is sometimes called as the western cordilleras or the pacific cordilleras and has various features and they include the highest peaks on the continent and the ranges runs for the north to the south along the three belts.

Nevadan belt, Laramide belt and the pacific coastal ranges of the west. And thee three orographic belts are due to the engagement of the tectonic plates and this deformed the earth surface layer and  thus giving rise to the slopes and the highland peaks.