The layer (or play) effective role in space communication at night is (or are) :A. D-layerB. E-layerC. `F_(1)`-layerD. `F_(2)-`layer

The layer (or play) effective role in space communication at night is

1.	The layer (or play) effective role in space communication at night is (or are) :A. D-layerB. E-layerC. `F_(1)`-layerD. `F_(2)-`layer
Answer» D-layer and `F_(1)` layer disappear at night.

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The layer (or play) effective role in space communication at night is (or are) :A. D-layerB. E-layerC. `F_(1)`-layerD. `F_(2)-`layer

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