we can now see.Sullivan, R., Anderson, R., Biesiadecki, J., Bond, T., and Stewart, H., 2011, "Cohesions, friction angles, and other physical properties of Martian regolith from Mars Exploration Rover wheel trenches and wheel scuffs." J. Geophys. Res.: Planets, 116, E02006. https://doi.org//10.1029/2010JE003625. The meteorite, gravity, and wind-driven processes work like this: Over billions of years, meteorite impacts created many craters on the plain. There were enough small (5 to 30 m diameter) craters created in the eon of around three billion years to cover, on average, the whole plain once. Although, each small crater degraded and disappeared in about 25 million years or less, and only about 0.7% of the plain's area is presently covered in small craters. Each meteorite impact produces large numbers of blocks of sediment material in the crater rim and as ejecta around the crater. Most of the initial sediment blocks project above the surrounding material (by a few centimeters or more) and are exposed to saltating sand (i.e., wind-driven, bouncing sand). Meridiani sediment matrix is soft and easy-to-erode. It erodes about 30 to 300 times faster than other regions of Mars (such as Gusev Crater). (Although, this arid erosion is much slower than erosion with water flows.) The saltating sand erodes the soft, easy-to-erode parts of the sediment matrix in the projecting blocks. These blocks are either completely eroded or erode until they become smooth and no longer project into saltating sand. This block erosion creates dust particles and turns embedded spherules into loose spherules. The dust particles are blown off the plain and become part of the global dust. The sulfates preferentially turn into dust and are transported off the plain by the wind. The larger basalt sand particles, spherules fragments, and hematite spherules remain in place on the plain. Wind, gravity, and size-sorting created the soil bedforms from the basaltic sands, spherule fragments, and spherules. With the aid of gravity and wind, the original (small) crater holes are gradually filled in (with material from eroded rim blocks and other local erosion material), and the plain is returned to a flat state. Phil Christensen outlined these processes in 2004, soon after Opportunity landed. Later, more in-depth research confirmed them and added details to Christensen's outline.Olsen, R., M., 2021, "Iron Oxide Harvesting on Mars," In AIAA ASCEND 2021, Las Vegas, Nevada & Virtual. https://doi.org/10.2514/6.2021-4037 Blueberry Composition Early Blueberry Composition Results Early on, Opportunity's Mössbauer spectrometer took