Anywhere from 50 to 100,000 tons of mass is added to the earth each year. Though this does not appreciably increase the size of earth, it does increase the radius. There is no fixed earth. I thought fixed earth ideas went away with Aristotle's death over 2000 years ago?

The scientific community has dismissed the "Expanding Earth Theory". The following details are from the Wikipedia entry http://en.wikipedia.org/wiki/Expanding_earth_theory

"Modern measurements have established very stringent upper bound limits for the expansion rate, which very much reduces the possibility of an expanding Earth. For example, paleomagnetic data has been used to calculate that the radius of the Earth 400 million years ago was 102 ± 2.8% of today's radius.[6] Furthermore, examinations of earth's moment of inertia suggest that no significant change of earth's radius in the last 620 million years could have taken place and therefore earth expansion is untenable.[7]

The primary objections to an expanding Earth have centered around the lack of an accepted process by which the Earth's radius could increase and on the inability to find an actual increase of earth's radius by modern measurements. This issue, along with the evidence for the process of subduction, caused the scientific community to dismiss the theory of an expanding Earth."