Ok, I'll have a piece of it.

> We know that earth's magnetic field has reversed polarity many times in the past. We can tell this from the polarity of elements in lava flows from volcanoes, as they align themselves with the polarity of the planet at the time they cooled.

That's true. It's what convinced us that continental drift was possible.

> We also know from monitors that our earth's field is affected by the suns activity, and that it shifts by several degrees during a heavy solar storm.

Yes. We also know that the earth's magnetic field is pretty weak, much weaker than a bar magnet for example.

> We know that earths crust is made up of several plates, which drift on molten rock.

No, this is wrong. The layers under the crust are not molten until you get to the outer core. It's only because the drifting is so slow that it's possible at all.

> When the plates push under one another, this molten rock is ejected through volcanoes,

What really happens is that in those areas the pressure is reduced enough to allow melting to occur.

> and earthquakes occur on the brittle edges.

Yes.

> The "Ring of Fire" in the Pacific Ocean is a huge ring of volcanoes lining the pacific tectonic plate.

Not a continuous one, to be sure.

> We know that many of earths deserts used to be oceans, and that many sections of the ocean floors were deserts and land. It would appear that the plates raise and lower, in addition to drifting.

Also true.

Roger