Final answer:
The polar zone is the smallest thermal zone on the planet with cold temperatures and minimal vegetation.
Explanation:
The polar zone is the smallest thermal zone on the planet.
It experiences the coldest temperatures due to its location near the poles, characterized by icy conditions and minimal vegetation.
This zone is represented by the letter E in the Koppen-Geiger Climate Classification system.
Learn more about Thermal zones on the planet here:
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