Here is the process of leaching and absolute accumulation cations Fe 3+, Fe 2+, Al 3+; Mn6 +. This cations available in tropical soil by rain and water repellent effect, groundwater, we have the opportunity to gather together in one place in the soil with high density. This cations absorbed into a negatively charged group (colloidal clay or iron oxide) or other agents that bonding between cations to create sustainable relative links. When the ambient temperature rises, the humidity is lower, this link dehydration, will create solid metal oxide, so high and very high stiffness.
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