(A) Corona, chromosphere, photosphere
<u>Explanation:</u>
- Photosphere - it is the Sun’s deepest layer, and the layer visible to human eyes directly from the Earth. It is also called the solar surface
- Chromosphere - This layer of the Sun is located between 250 miles and 1300 miles above the photosphere. The chromosphere has temperatures around 4000K at the base, and 8000K at the top.
- Transition Region - This layer is very thin with a size of about 60 miles, and it is present between corona and the chromosphere.
- Corona - This layer is the Sun’s outermost layer. It starts at roughly 1300 miles over the photosphere and it has no upper limit. Its temperature is between 500,000 K to 1 million K.
