This is the geological theory where the cooler surface of the earth move slowly over the hotter layer underneath.

Plate tectonics is the theory explaining that the Earth's crust is divided into numerous plates which is the cooler surface of the earth and many more related phenomena as a result from gliding over the rigid and hard shell which is the mantle, the hotter layer underneath the crust.

The study of where things are 

Ibelieve it is- a mixed economy offers some protection for consumer rights but still allows a good deal of choice.