Final answer:
The transition region is the area in the sun's atmosphere above the chromosphere where the temperature increases significantly, reaching nearly a million degrees as it approaches the corona.
Step-by-step explanation:
The transition region is the area in the sun's atmosphere above the chromosphere where the temperature increases significantly, reaching nearly a million degrees as it approaches the corona.The area in the sun's atmosphere located above the chromosphere (1500-10000 km) where the temperature rises dramatically is called the transition region.
This region marks the change in temperature from about 10,000 K in the chromosphere to nearly a million degrees as it approaches the corona. The transition region is only a few tens of kilometers thick and is situated between the chromosphere and the corona, leading to a rapid increase in temperature over a short distance.