What do we call the moisture content at which a soil stops being rigid and becomes moldable?

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Multiple Choice

What do we call the moisture content at which a soil stops being rigid and becomes moldable?

The moisture content at which a soil stops being rigid and becomes moldable is the Plastic Limit. In Atterberg limits, soils go from solid (rigid) to plastic as water content increases. The Plastic Limit marks the boundary between the semi-solid and plastic states: below this limit it’s rigid and crumbly, and at or above it it can be molded without cracking. If you add more water, the soil reaches the Liquid Limit, where it behaves plastically and then flows like a liquid. The Plastic Index is the difference between the Liquid Limit and the Plastic Limit, indicating the range of moisture over which the soil behaves plastically. Organic Tier isn’t a standard term in this context.

The moisture content at which a soil stops being rigid and becomes moldable is the Plastic Limit. In Atterberg limits, soils go from solid (rigid) to plastic as water content increases. The Plastic Limit marks the boundary between the semi-solid and plastic states: below this limit it’s rigid and crumbly, and at or above it it can be molded without cracking. If you add more water, the soil reaches the Liquid Limit, where it behaves plastically and then flows like a liquid. The Plastic Index is the difference between the Liquid Limit and the Plastic Limit, indicating the range of moisture over which the soil behaves plastically. Organic Tier isn’t a standard term in this context.

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