Final answer:
The natural features of the Cascade Mountains region include active volcanoes, glaciers, high peaks, river valleys, and rugged seacoasts.
Step-by-step explanation:
The Cascade Mountains are part of the Pacific Coast Mountain Range and are known for their volcanic activity. They are home to several active volcanoes, including Mount Rainier and Mount St. Helens.
The mountains also have numerous glaciers, such as the Nisqually Glacier on Mount Rainier. These glaciers play an important role in shaping the landscape and supplying water to surrounding areas.
The Cascade Mountains have many high peaks, with Mount Rainier being the tallest at over 14,000 feet. The region is also characterized by deep river valleys, such as the Columbia River Gorge, and rugged seacoasts, like those found along the Oregon coast.