What are the main forces that shaped the landscape of Washington?

The landscape of Washington has been shaped primarily by volcanic activity, glacial processes, and tectonic forces. The Cascade Range, formed by volcanic eruptions, features iconic peaks like Mount Rainier. Glaciers during the last Ice Age sculpted valleys and created features such as Puget Sound and the Columbia River Gorge. Additionally, tectonic uplift and erosion have further influenced the state's diverse topography, resulting in a mix of mountains, forests, and Coastlines.