Which boundary does the S-Wave Circle represent? Between ___ and ___ What is the innermost layer of the earth - solid, liquid or gas? _
If the p waves don’t go straight through this inner layer, what happens to them?

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( solar wind );

Answercompass direction;