Recent discoveries have shown that we need to realise that there are many living things in the earth and rock below us going far down (kilometers) into the earth. Textbook writers take note!
According to a report from the Guardian:The Earth is far more alive than previously thought, according to “deep life” studies that reveal a rich ecosystem beneath our feet that is almost twice the size of all the world’s oceans.
Despite extreme heat, no light, minuscule nutrition and intense pressure, scientists estimate this subterranean biosphere is teeming with between 15bn and 23bn tonnes of micro-organisms, hundreds of times the combined weight of every human on the planet.