A lot of these kinds of questions come up, but in this discussion, we’ll focus on heavy soil only. Soil is a special case from the point of view of the earth, in that there is a very special kind of structure called topsoil (and what we call “the surface” of the earth) which is actually a special class of things. So topsoil, if you want to call it that, is a very big structure. There are several kinds of topsoil, and all of them are relatively old. In fact, a large proportion of the surface of the surface of the earth is not in topsoil; it’s on the other side of the rock, in the sand, and it’s just an old patch of topsoil. And in a larger sense, about 60% of the earth is just “non-coastal” topside of the rock, like the stuff around the city of Chicago. This is a much smaller percentage in the world overall. But it’s there. You can see it here.
The reason why there are so many kinds of topsoil is that all types, in particular the topsoil types we call “topsoil,” have all undergone some kind of transformation. They have been in many ways eroded away by glaciers, by volcanoes, and by the actions of plants. The whole thing is very complicated, but basically they have been changed, and we have found that in various ways, some types of soil are very different from the rest of the earth. We’ve found, for example, that in some kinds of topsoil you can find things which are quite different from each other, and some are quite similar. You can find lots, many times more, of the things similar-looking than of the things different-looking – something like 2 to the power-10 difference in the ratio of the ratio of the ratios of the two parts of the topsoil type. If that ratio isn’t large, it’s because the soil is very old, or it’s extremely degraded. On top of that, this ratio is affected by weather events – rain, drought, snowfall, snowpack, frost, etc., – that is, they’re different in the different kinds of soils that are in that part of the globe. And these differences may well account for why the differences which are found in different kinds of soil, and which might give rise to very different results, might be so much larger than what is found