Description
The earth's grandest illusion is that it appears never to change; a myth which has become embodied in our everyday language. As old as the hills', 'the everlasting sca', 'terra firma' all embody the concept of a never-changing earth. True there are occasional dramatic and often devastating volcanic eruptions and earthquakes, but such events only ever affect a relatively small area of the earth's surface.
The earth's secret is time. Spans of time which are measured not in hundreds of years, but in hundreds of thousands and millions of years. The most important agent in the moulding of the earth is water. Water, time and gravity together can achieve the impossible.
