As stars get older they get cooler and you know when you light a flame the part at the bottom is hotter so its also applies to stars, the star is very hot because it is newer and has more gas so it appears blue to us
Answer:
It's practiced in sparsely populated regions because of less things being in the way. This way, they can use irrigation more efficiently.
The coolest layer is the crust. The crust is on the surface of the earth (where we are) . Inner Core
<span>There were probably several, but it is a deadly sickness if not treated and the outbreak in the middle ages killed 1/3 of Europe. Some cures were weird things like eating crushed emeralds or drinking poison. Some symptoms included swollen lymph nodes and bleeding out in many places </span>