Was this world or earth at one point one unit not divided into continents? ?
The continents have indeed been changing position, size and shape ever since the Earth cooled enough to form a solid crust. You should Google the topic of ‘plate tectonics’ (earlier term used was ‘continental drift’). The Earth’s crust is divided into a number of plates of varying size, some of which have continents – land masses – sitting on them, as it were. These are moved around, slipping past or grinding into one another and sometimes splitting apart, as a result of convection currents in the molten magma beneath them. It is an absolutely fascinating subject, especially with regards to the effect of these movements on the evolution of life. South America and Africa were in fact a single land mass some tens of millions of years ago. A split opened which became the southern part of the Atlantic Ocean, a process continuing to this day (i.e. the Atlantic Ocean is getting wider by a few centimetres every year). One piece of evidence for this is the similarity in geology and in the pres
