Which mountain range crosses through Washington?

The correct answer is the Cascades, which is a significant mountain range that runs through the state of Washington. This range is well-known for its volcanic activity, including notable peaks like Mount Rainier and Mount St. Helens. The Cascades are central to Washington's geography and climate, influencing weather patterns and providing diverse ecosystems.

The Rockies, while expansive, are primarily located to the east of Washington and stretch through states like Montana, Wyoming, and Colorado. The Appalachians are situated much farther to the east and do not extend into Washington at all. The Sierras, known for their stunning beauty and national parks, are primarily found in California and do not cross into Washington. Understanding the geography of the United States can help clarify the distinct locations of these mountain ranges.