When Professor Lidenbrock and Axel arrive to the top of Scartaris, it is midnight but they can see the light of the sun in the sky. Probably the same image that you can see in the picture below. How it is possible to see the Sun in the midnight? What happens if you go to the Snaefflels volcano just in Christmas? Write your answers as a comment. You will win points to reach the centre of the Earth.
View from the Snaeffels on the summer solstice by Anjali Kiggal - Own work, CC BY-SA 4.0, (https://commons.wikimedia.org/w/index.php?curid=41288276)