Asked by Pickle to Lindsay on 23 May 2015.
Keywords: clay, microscopic
Clay particles are VERY small (less than 0.002 mm), so there aren’t any kinds of soil that are smaller. However, there are LOTS of non-geological things that are a LOT smaller, like DNA (2 nanometers wide), for instance. So, really, it depends on what you would like to compare your clay to! 🙂
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