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.

Population of this city. also, look for information on available public transit, bike-sharing, and other commuting options. use the information you find and write about it promoting alternative transportation