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Prefix for sphere, 4 letters

Prefix with sphere, 4 letters

Prefix with sphere or scope, 4 letters

Sphere intro, 4 letters

Sphere opening, 4 letters

Sphere starter, 4 letters

Start for sphere, 4 letters

Perfume ingredient, 6 letters

From 50 to 400 kilometers up, roughly, 10 letters

Layer around Earth affecting radio waves, 10 letters

Radio wave reflector, 10 letters

Region 30-250 miles above the earth's surface, 10 letters

Where the D layer is, 10 letters

Where the Northern Lights occur, 10 letters

The outer region of the Earth's atmosphere, 10 letters

Contains a high concentration of free electrons, 10 letters

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