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Boundary layer: In physics and fluid mechanics, a boundary layer is the layer of fluid in the immediate vicinity of a bounding surface where the effects of viscosity are significant. In the Earth's atmosphere, the atmospheric boundary layer is the air layer near the ground affected by diurnal heat, moisture, or momentum transfer to or from the surface.
Boundary Waters Canoe Area Wilderness: The Boundary Waters Canoe Area Wilderness , is a 1,090,000-acre (4,400 km2) wilderness area within the Superior National Forest in northeastern part of the US state of Minnesota under the administration of the U.S. Forest Service. A mixture of forests, glacial lakes, and streams, the BWCAW's preservation as a primitive wilderness began in the 1900s and culminated in the Boundary Waters Canoe Area Wilderness Act of 1978.
Boundary marker: A boundary marker, border marker, boundary stone, or border stone is a robust physical marker that identifies the start of a land boundary or the change in a boundary, especially a change in direction of a boundary. There are several other types of named border markers, known as boundary trees, pillars, monuments, obelisks, and corners.
Boundary commissions (United Kingdom): The boundary commissions in the United Kingdom are non-departmental public bodies responsible for determining the boundaries of constituencies for elections to the House of Commons. There are four separate boundary commissions: Boundary Commission for England Boundary Commission for Scotland Boundary Commission for Wales Boundary Commission for Northern IrelandEach commission comprises four members, three of whom take part in meetings.