Marcia Bjornerud

“According to pioneering microbiologist Lynn Margulis, "fully 10 percent of our own dry body weight consists of bacteria, some of which, although they are not a congenital part of our bodies, we can't live without." In fact, a healthy human body has more bacterial cells than animal cells (bacterial cells are far smaller). Our own bodies are in some ways microcosms of the biosphere as a whole.”
― Marcia Bjornerud, Reading The Rocks: The Autobiography of the Earth

“With each integer on the Richter scale, there is a tenfold increase in the number of earthquakes that occur annually. On average, there is one magnitude 8 event, ten magnitude 7 events, a hundred magnitude 6 events, and so on, each year. If we consider this from an energy standpoint, the smaller earthquakes account for a significant fraction of the total seismic energy released each year. The one million magnitude 2 events (which are too small to be felt except instrumentally) collectively release as much energy as does one magnitude 6 earthquake. Although the larger events are certainly more devastating from a human perspective, they are geologically no more important than the myriad less newsworthy small ones.”
― Marcia Bjornerud, Reading The Rocks: The Autobiography of the Earth