I suspect there are numerous readers, here, who subscribe to the "subduction" plate tectonics model and reject the idea of an expanding Earth.
Here is a lengthy and well documanted article by Davit Pratt that chronicles the problems with the "subduction" plate tectonics model:
Plate Tectonics: A Paradigm Under Threat (hat tip Lloyd):
http://newgeology.us/presentation20.html
(The article does not rely on creationist ideas, but rather documentation from conventional geology, itself.)
According to the orthodox model of plate tectonics, the earth's outer shell, or lithosphere, is divided into a number of large, rigid plates that move over a soft layer of the mantle known as the asthenosphere, and interact at their boundaries, where they converge, diverge, or slide past one another. Such interactions are believed to be responsible for most of the seismic and volcanic activity of the earth. Plates cause mountains to rise where they push together, and continents to fracture and oceans to form where they rift apart. The continents, sitting passively on the backs of the plates, drift with them, at the rate of a few centimeters a year.
But numerous individuals in geology have pointed to assumptions that have colored geology:
Van Andel (1984) conceded that plate tectonics had serious flaws, and that the need for a growing number of ad hoc modifications cast doubt on its claim to be the ultimate unifying global theory. Lowman (1992a) argued that geology has largely become "a bland mixture of descriptive research and interpretive papers in which the interpretation is a facile cookbook application of plate-tectonics concepts ... used as confidently as trigonometric functions" (p. 3). Lyttleton and Bondi (1992) held that the difficulties facing plate tectonics and the lack of study of alternative explanations for seemingly supportive evidence reduced the plausibility of the theory.
One of the most damaging pieces of scientific evidence is about the depth of the continents into the body of the Earth, or in other words, how deep do the roots of the continents go into the Earth.
Seismic tomography, which produces three-dimensional images of the earth's interior, appears to show that the oldest parts of the continents have deep roots extending to depths of 400 to 600 km, and that the asthenosphere is essentially absent beneath them. McGeary and Plummer (1998) say that these findings cast doubt on the original, simple lithosphere-asthenosphere model of plate behavior. They do not, however, consider any alternatives.
In elaboration:
...[T]he compelling seismotomographic evidence for deep continental roots (Dziewonski and Anderson, 1984; Dziewonski and Woodhouse, 1987; Grand, 1987; Lerner-Lam, 1988; Forte, Dziewonski, and O'Connell, 1995; Gossler and Kind, 1996)...evidence from seismic-velocity, heat-flow, and gravity studies has been building up for several decades, showing that ancient continental shields have very deep roots and that the low-velocity asthenosphere is very thin or absent beneath them (e.g. MacDonald, 1963; Jordan, 1975, 1978; Pollack and Chapman, 1977). Seismic tomography has merely reinforced the message that continental cratons, especially those of Archean and Early Proterozoic age, are "welded" to the underlying mantle, and that the concept of thin (less than 250-km-thick) lithospheric plates moving thousands of kilometers over a global asthenosphere is unrealistic.
But even with all the, above, scientific evidence, textbook and public parlance continues to propagate this simplistic view of the Earth's interior and the general public remains unaware of this evidence:
Nevertheless, many textbooks continue to propagate the simplistic lithosphere-asthenosphere model, and fail to give the slightest indication that it faces any problems (e.g. McLeish, 1992; Skinner and Porter, 1995; Wicander and Monroe, 1999).
Where have readers, here, seen that before?
It's no wonder that the public swallows the naive idea that continents go wondering the surface of the planet and get together for occasional orgies, called supercontinents.
But the majority of scientific evidence suggests this is wholly impossible.
40,000 miles of mid-ocean spreading ridges are an undeniable scientific fact.
If continents can't go sloushing around the surface of the planet like butter on a hot skillet because they have roots 400 km to 600 km deep, and so-called "subduction" doesn't happen, that leaves only one possibility:
The Expanding Earth theory.
(The David Pratt article is quite lengthy, but if you want to get to the bottom of the "subduction" controversy, without the spin and the stonewalling from mainstream geologists, this is a must read article.)