Question 2
which type of sand is best suited for agriculture?

question 2 options:

soil that is sandy and loose that contains gravel

black soil that contains a lot of water

soil that is highly compacted

brown or red soil with adequate moisture and air flow

question 3
what to decide how land will be used?

question 3 options:

soil maps

farmer surveys

gps data

soil surveys

Question 2's answer would be 

Black soil that contains a lot of water.

Question 3's answer i believe would be soil surveys 

Hope this helped!

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.