The dominant geographic feature in north africa is
a)
a desert.
b)
a plateau.
c)
rain forest.
d)
tropical jungle.

The dominant geographic feature in north africa is: desert.
North africa mostly have desert area, there is a lot of desert in north african, which is kalahari, karoo, namib and etc.

hope this help

Earths place in space 

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.