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What is an "isothermal layer"?

  • A

    An atmospheric layer where temperature increases with increasing height.

  • B

    A boundary area between two other layers within the atmosphere.

  • C

    An atmospheric layer with constant temperature with increasing height.

  • D

    An atmospheric layer where temperature decreases with increasing height.

If the temperature remains constant with height, such as at the tropopause, it is referred to as an isotherm or an isothermal layer. In an isothermal layer, the environmental lapse rate is 0°C per 1000 ft.

When the temperature increases with height, this phenomenon is known as an inversion.

Isotherms and inversions in the troposphere typically occur within a relatively well-defined layer.

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