Figure 2: REE preferential denudation over time under abiotic and biotic influence and physical changes in the rock.
From: Ecosystem Composition Controls the Fate of Rare Earth Elements during Incipient Soil Genesis

(A) Cumulative denudation per column for a sum of all REE relative to their rock content. Values are means of three replicate columns and error bars represent one standard error of the mean. C, control; B, bacteria; BG, bacteria-grass; BGM, bacteria-grass-mycorrhiza. (B) An example of micro-fracture development during incipient weathering of basalt, as shown by electron microprobe imaging of a grain extracted at the end of the experiment from abiotic control.