Geography Summary :: Papers

Geography Summary A very long time ago, in fall outer space. There was an part, invisible to the naked eye. No one knows how the atom was created, it was just there. This atom was very concentrated and very dense. Approximately 30 billion years ago, that atom exploded and out came the material use to create the entire universe. Of course, back then. The universe was very different from today. This is the large bang theory, it wa sproposed by George Gamow a Russian American. According to the theory, the gouge of the explosion is still making us drift and then forget pull us back bringing our existence to an end. When the earth was commencement created, there was only one continent. It was called Pangea. The Pangea then split up into both small continents named respectively Laurasia and Gondowanaland. Finally, both Laurasia and Gondowanaland split up into yet smaller continents, resulting in a final count of 7 continents. This theory is called Continental Drift and it was suggested by Alfred Wegener in 1912. Convection currents is how heat moves in liquids. We find convection currents wrong the moho but we can also find convection currents in a batch of boilling water. Convection currents are circles of heat side by side moving in opposite directions. When these happen inside the moho, many things can happen. At rough points on the earth parts of the crust can be sucked tubing make cracks on the ground. At other places on earth, the currents can weightlift up the crust, thus making a hill. Convection currents are what causes tectonic plates to move. With out convection currents, there probably wouldnt be any continental drift. As you learnt in the previous paragraph, convection currents take place in the Moho. The Mohorovicic discontinuity is the boundary mingled with the crust and the mantle. The material inside the moho are smi molten rocks.