To identify the names of the Sun's layers described in columns A, B, and C, let's match the given properties (Position, Thickness, and Temperature) to the knowledge of the Sun's atmospheric layers.
The three layers of the Sun's atmosphere that we are considering are:
- Photosphere
- Chromosphere
- Corona
Now, let's analyze the given data for each column:
### Column A:
- Position: Lowest
- Thickness: 100 km
- Temperature: 5,500 K
The layer with these properties is the Photosphere, as it is the lowest layer of the Sun's atmosphere, and has a thickness of about 100 km with a temperature around 5,500 K.
### Column B:
- Position: Middle
- Thickness: 2000 km
- Temperature: 6,000 to 20,000 K
These properties match those of the Chromosphere, which is the middle layer of the Sun's atmosphere, has a thickness of a few thousand kilometers, and has a variable temperature range from about 6,000 K to 20,000 K.
### Column C:
- Position: Outermost
- Thickness: Millions of kilometers
- Temperature: 2,000,000 K
These properties are characteristic of the Corona, the outermost layer of the Sun's atmosphere, which extends for several million kilometers and has a very high temperature of about 2,000,000 K.
Therefore, the names of the Sun's layers described in columns A, B, and C are:
A: Photosphere; B: Chromosphere; C: Corona
So, the correct answer is:
A: Photosphere; B: Chromosphere; C: Corona
