Soil Particles

In granulometry, the particle-size distribution (PSD) of a powder, or granular material, or particles dispersed in fluid, is a list of values or a mathematical function that defines the relative amount, typically by mass, of particles present according to size.

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Apollo 15 astronaut Dave Scott got his drill stuck on the moon during an experiment. When he reached a depth of 5.3 feet, lunar soil particles rode up the helix of the drill bit and halted its momentum, postponing his task. The drill chuck was later auctioned for almost $50,000 in 2016

Soil Particles in Australia Could Be Leaking Radioactive Plutonium. Here's Why