- King County, located in Western Washington, covers some 2,100 square miles extending from the crest of the Cascade Range to Puget Sound, including Vashon Island. It is Washington’s most populous county and contains its largest city – Seattle. It is the commercial center of the Pacific Northwest with public and private enterprises including Boeing, Costco, Group Health Cooperative, Washington Mutual, Starbucks Coffee Co., Amazon.com, University of Washington, Microsoft, PACCAR Inc, Weyerhaeuser, Seattle City Light, and the Port of Seattle, which operates the nation’s eighth-largest port as well as Sea-Tac International Airport…
- Sedimentary rock (Wikipedia)
Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth’s surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles to settle in place. The particles that form a sedimentary rock are called sediment, and may be composed of geological detritus (minerals) or biological detritus (organic matter). The geological detritus originated from weathering and erosion of existing rocks, or from the solidification of molten lava blobs erupted by volcanoes. The geological detritus is transported to the place of deposition by water, wind, ice or mass movement, which are called agents of denudation. Biological detritus was formed by bodies and parts (mainly shells) of dead aquatic organisms, as well as their fecal mass, suspended in water and slowly piling up on the floor of water bodies (marine snow). Sedimentation may also occur as dissolved minerals precipitate from water solution.