Most Influential Geological Process In Washington's Geography

Picture via Wikipedia

          I believe the most influential geological process in forming Washington's geography was Glaciation.  Glaciation is when glaciers move and erode away valleys and huge paths in the ground, or other things, such as flooding, resulting from this movement. The first reason Glaciation was the most influential was because Glaciation created the Puget Sound . That entire waterway in Washington was caused by the Puget Lobe, which was a glacier. Also there are many glacial lakes in Washington all caused by Glaciation. Dry Falls was also caused by Glaciation. Dry falls was the biggest waterfall in the country when it was still active. Dry Falls was so big Niagara Falls would have been insignificant next to it. It was caused when a glacier created flooding. The fourth reason Glaciation was the most important geological process in shaping Washington's geography was the Palouse Hills. Palouse Hills were created through glacial till, a result of Glaciation. Glaciation is also responsible for the San Juan Islands. Glaciers came as far south as Olympia at the peak of glacial coverage in Washington. The  Polson Lobe was also was a hugely influential. This was because it blocked Clark Fork for over one year and caused flooding which created Lake Missoula, and the Channeled Scablands after the glacial dam broke.

Trail Eroded by Glacier   Picture via Wikipedia