So here’s something to blow your mind – sand is a microbiome. Billions of organisms live in the sand. In fact, a 2017 study revealed that on one grain of sand there may be between 10,000 and 100,000 microorganisms!!! The organisms you find (if you have a very good microscope, of course) varies depending on the beach. Not only that, but the organisms in one part of the beach will be different from organisms from another part of the beach.
The sand is very much an extreme environment. To start, there’s not much space. But these organisms are small enough to move around between the grains of sand! They are also hardy enough to withstand the constant pounding of waves. And, sometimes there’s water in the tiny ecosystem, and other ties the tide goes out and there’s none. So now, every time you go to the beach, consider the universe underfoot!