When does the solstice occur when both halves of the Earth get the same amount of daytime & nighttime

on December 22

when one half the Earth gets the least amount of day while the other gets the most

June 21

Item at position 9

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Answer volcanic outgassing;