Land and air are examples of capital goods natural resources human resources

Land and air are examples of Natural Resources. They are known as natural resources because they are existed in a natural way. It can't be destroyed nor made.

~Hope this helps!

The answer would be : natural ressources.

Hope this helps !

Photon

B. to study the spatial patterning of forests and forests fires and plan for better use of fire fighting resources in the u.s.

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.