Two or three million years ago, the Earth was a ball of fire, revolving arround it's own axis. It took millions of years to cool under the constant downpour of rain. The Process was slow, imperceptible, but the gradual change - transition - came to pass. Same for generation after generation of evolution on Earth. Nature never jumps. She works in a leisurely manner, experimenting continuously. The same natural transition can be seen in man. This gradual change, transition, works every where, silently building storms and destroying soloar systems.