http://en.wikipedia.org/wiki/Expanding_Earth#Scientific_consensusFigureing out if the earth is exspanding or contracting is actually important, because of dangers it might present to the world population, and also there are all kinds of intreseting ideas about life under the crust, and ocean water rises ect...
DwayneD.L.Rabon
Generally, the scientific community finds that there is no evidence in support of the Expanding Earth theory, and there is evidence against it:
Measurements with modern high-precision geodetic techniques show that the Earth is not currently increasing in size to within a measurement accuracy of 0.2 mm per year.[16] The lead author of the study stated "Our study provides an independent confirmation that the solid Earth is not getting larger at present, within current measurement uncertainties".[17] The motions of tectonic plates and subduction zones measured by a large range of geological, geodetic and geophysical techniques supports plate tectonics.[18][19][20]
Paleomagnetic data has been used to calculate that the radius of the Earth 400 million years ago was 102 ± 2.8 percent of today's radius.[21][22]
Examinations of data from the Paleozoic and Earth's moment of inertia suggest that there has been no significant change of earth's radius in the last 620 million years.[23]
http://www.sciencedaily.com/releases/2011/08/110817120527.htm
Using a cadre of space measurement tools and a new data calculation technique, the team detected no statistically significant expansion of the solid Earth.