"It's a bit like going to the doctor, the ecologist Dr Jake Robinson said. They put a stethoscope on your chest, take a health check, listen to your beating heart - we're doing something similar in the soil."
"Land filled with plants and tiny animals carried diverse underground sounds, while cleared land only had bland white noise, they found. This indicates that a healthy soil ecosystem is rich in life and sound."
"Insects and other invertebrates build up soils, improve their nutrient content and prevent erosion, so their presence is a good indication of soil health."
"Restoring and monitoring soil biodiversity has never been more important, Robinson said. More than 75% of soils around the world are degraded, highlighting the urgency of this research."
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