Which describes the St. Lawrence River? Question 1 options:

carries more water to the Mississippi River than any of the other tributaries

forms much of the western border of the states of Wisconsin, Illinois, Kentucky, Tennessee and Mississippi.

is one of the longest rivers in North America

carries the water eastward for 750 miles until it empties into the Atlantic Ocean

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.