Arctic Circle

Arctic Circle

Latitude of 66. 5° North. The southern limit of the area of the Earth that experiences 24 hours of darkness or 24 hours of day at least one day during the year.

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Industry/Domain: Earth science
Category: Oceanography
Company: Marine Conservation Society
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Arctic circle

Geography; Physical geography

The line of latitude that forms the boundary between the North Temperate Zone and the North Frigid Zone.

arctic circle

Geography; Physical geography

Latitude of 66.5° North. The southern limit of the area of the Earth that experiences 24 hours of darkness or 24 hours of day at least one day during the year.

arctic circle

Science; General science

The parallel of latitude approximately 66°30' north of the Equator, or 23.5° from the North Pole. Named for the northern constellation Bear, the Arctic Circle has the same ...

placer

Earth science; Oceanography

A layer of minerals laid down by flowing water. People who pan for gold search through placers.

reef

Earth science; Oceanography

An underwater ridge of rock that rises up to or near the surface. Reefs are important ecosystems that provide home for sea life.

aquascape

Earth science; Oceanography

A scenic view of a body of water; an area having a natural or constructed aquatic feature (as a pond or fountain).

equatorial rossby wave

Earth science; Oceanography

An equatorially trapped westward propagating wave that moves due to isentropic gradients of potential vorticity. The meridional velocity of the n'th mode of these waves has the ...

blackbody radiator

Earth science; Oceanography

A hypothetical, ideal radiator that totally absorbs and reemits all energy incident upon it. Actual objects only approach this ideal.

shear instability

Earth science; Oceanography

An instability of an unbounded parallel shear flow to the growth and nonlinear development of waves with phase speed in the along flow direction approximately equal to the speed ...

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