Definitions for d layer
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Random House Webster's College Dictionary
D layer(n.)
the lowest region of the ionosphere, at an altitude of ab. 50 mi. (80 km).
Category: Physics
Origin of D layer:
1930–35
Citation
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"d layer." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/d layer>.

