If geosciences are way more white (and male) than the general population, which they are, what, if not systemic racism, explains the racial make up of the field?

Let me try explain how I see this. Let's say there's a filter, and water flows through it. Stuff that is in the water may or may not flow through it.

Over time, you see that on one side of the filter, the water is really full of all sorts of components, including red beads, blue beads, and green beads. But on the other side, you consistently see 80-90% blue beads (the number is not significant or representative. Any number that isn't reflecting the composition in the "pre-filter" side will do).

Now, it is entirely plausibe that for a few moments, the distribution in the post-filter side to deviate from the pre-filter side. But consistent difference in one direction means only one thing: the filter is more permissive of one type of bead over others. The longer this persists and the greater the deviation, the more certain it is that the filter is selective, and biased towards one color bead over others.

This isn't opinion. There's no other mathematical explanation.

That filter, if you remap the metaphor to reality, is systemic racism. It has nothing to do with individual people being moustache-twirling racists waiting to harm people of color. It is generations of structures, legal, political, economic and ecological that bias the system to be selective in a way that is reflected by consistent disparity between the composition of the population and the composition of the field of science/government/workforce in a particular economic field, whatever you will.

Now, you're telling me this is all nonsense. Okay. What then is the explanation for the facts? White people are inherently more suited for/interested in geosciences? If not that, what?