 So in our discussion of the Holström diagram, we've been talking about some of the Corsair grains, the sand size grains, granules, pebbles, and cobbles. And for all of those grains, we go from deposition to transport as you increase the flow speed, you increase the size of grains that can get deposited. And the same thing is true in terms of deposition for the finer grains. If you have a flow of something like 20 centimeters or 2 centimeters per second here, you'll be transporting silt-sized grains, and they will continue to be transported until the flow actually gets all the way down here at something like 0.15 centimeters per second. So we have this general relationship that as the flow slows down, you get deposition of the Corsair grains, and then the finer grains require a much lower flow. The erosion line is a little bit different. When you have the sand, you can erode grains, and as the flow speed gets higher, you erode Corsair grains. But there's this interesting relationship when you get down into clay and silt-sized grains, which are collectively called mud, as well, in that the behavior of the mud changes because of the very high surface area to the volume. And what happens is that you end up getting the grains sticking to each other, and that makes it much harder to erode these fine grain sizes. So we know this from experience if we step on wet sand, it tends maybe a few grains stick to your shoes, but if you actually step in wet mud, you can get big chunks of that mud sticking to your shoes. That's because of the high surface area compared to the volume, and also because a lot of these fine grains like clay minerals have charged surfaces, and if there are some cations in the water, they can actually help the minerals adhere to each other. So if we look at this diagram, what happens is that very fine sand, to fine sand, there's not much variation in the flow speed that it takes to erode those grains. There is a big change in the flow speed to deposit them if those grains are already moving. When we start getting to finer grains, that effect of the stickiness of the area increases, and so even a flow at 100 centimeters per second will not erode consolidated clay. It'll flow over the top of it instead, even though if we follow this line over, that same flow can erode pebbles. So what this means is that if you have, for example, consolidated clay layer here, you could actually get sand and pebbles transported across the top without eroding that clay. So there's this really interesting relationship that sometimes you can see very coarse grains sitting on top of clay, but one of the key aspects is it needs to be consolidated. When mud first settles out of suspension, and it gets deposited down here, it's sometimes 75 percent water plus the mineral grains. And if you have that much water between the grains, you end up with unconsolidated mud, and that is actually much easier to erode. The water keeps the surfaces of the minerals from adhering to each other as much. So if the mud has just recently been deposited, it's easier to erode than if it has lost water and become consolidated. Thanks for watching.