How is rock eroded by glaciers and wind?

 Glacier-Rock is picked up through glacial plucking. The glacier then carries the rock until the glacier melts. The rock is then in a totally different spot. 
 Wind-Rock is moved by wind in small pieces, like as gravel, soil or sand. The rock then is dropped from the wind in a new spot.

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.