~Hello there!
Your question: Which part of the galaxy has gas with the hottest average temperature?
Your answer: The Halo is the part of the galaxy that has gas with the hottest temperature average.
Any queries ^?
Happy Studying!
I think you mean population density lol if so then the answer would be the relationship between the size of a certain area in the number of people who live there. Because geographers use it to measure a number of people living in a certain area. I hope this helps!
1 - Geosphere.
2 - Biosphere.
3 - Cryosphere.
4 - Atmosphere.
5 - Hydrosphere.
Please correct me if I'm wrong!! I'd be happy to fix it!!! :)