Equatorial Zone
Explanation
The classical division of the Earth into heat zones (or thermal zones) is based on the angle of the sun's rays and the latitudinal distribution of temperature. This classification divides the globe into three broad zones based on their distance from the Equator.
Analysis of the Classification:
- Torrid Zone: This zone lies between the Tropic of Cancer (23.5° N) and the Tropic of Capricorn (23.5° S). It is the only region on Earth where the sun is directly overhead at least once a year, making it the hottest zone.
- Temperate Zone: Located between the Tropic of Cancer and the Arctic Circle in the Northern Hemisphere, and the Tropic of Capricorn and the Antarctic Circle in the Southern Hemisphere. The sun never shines directly overhead here, resulting in moderate temperatures.
- Frigid Zone: Situated between the Arctic Circle and the North Pole, and the Antarctic Circle and the South Pole. These areas receive extremely slanted sun rays and are the coldest regions on Earth.
- Equatorial Zone: While the "Equatorial region" is a specific climatic belt characterized by low pressure and high humidity, it is not considered a distinct primary zone in the classical three-fold division of heat zones. Geographically, it is a subset located entirely within the Torrid Zone.
Key Takeaway:
The three distinct classical heat zones of the Earth are the Torrid Zone, the Temperate Zone, and the Frigid Zone.