What advantage do chile and argentina have in terms of their geographic location? they are home to the amazon rain forest, which supplies much of the region's water. they are near both atlantic and pacific trading routes. they have the longest growing season. they have tropical climates.

They are near both Atlantic and Pacific trading routes.

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.