Question

What heat zone lies
beyond 66.5degree on both hemispheres?

Answer 1

Artic Circle in North
Antarctic Circle in South


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Answer 2

Areas between the Arctic Circle and the North Pole and those between the Antarctic Circle and the South Pole receive sun rays at a big slant. Due to this, the sun is never much above the horizon. So, this part of the earth receives the least amount of heat and remains very cold. These zones are called Frigid Zones.

SO, Frigid Zone is the heat zone lies  beyond 66.5° on both hemispheres.