The North African countries of have national soccer teams that often compete in the World Cup soccer match. A.
Spain and Somalia
B.
Somalia and Sudan
C.
Morocco and Kenya
D.
Algeria and Egypt

D.  Algeria and Egypt

Explanation:

North Africa is generally the area above the Sahara belt in Africa. Most of the countries are Arab nations.

These countries are Egypt, Libya, Morrocco, Algeria, Tunisia e.t.c

The best choice here is Algeria and EgyptThe Pharaohs of Egypt are a dominant force in the global soccer scene. Egypt has qualified for the world cup 3 times. Algeria has featured in a record of 4 world cupsTheir national team is known as desert foxes.

Mantle convection is the process that drives plate tectonics. the theory of plate tectonics states that the crust is divided into plates that float on the semi molten mantle below. the circular motion of the magma as it slowly rises and falls or move though convection cells drags the plates along causing them to move. the heat source in the lamp would represent the earth's core. the core is the source of energy that drives convection in the mantle. the lava represents molten magma under the earth's surface. if the lava lamp had floating pieces they would move as the circular motion of the lava in the lamp as it rises and falls would move them along the surface. these floating pieces would represent pieces of the earth's crust. 

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.