Keeping track of water makes for tricky science. It drains through soil, slips through cracks in rocks and refills underwater reserves. It bubbles up through springs and runs in rivers. Water evaporates and forms clouds; rain brings it back to earth, where it keeps plants alive and drains into the soil again.
Scientists who study water’s movements recently reported that levels of groundwater — water found in soil or pooled in underground reservoirs — have been dropping for the last nine years in many places. Part of that decrease is probably due to human activities. People drill wells and pump water from deep underground pools, especially in dry areas, to grow crops and supply drinking water. The new study suggests we’re pumping out too much. Read more at Science News for Kids, in this snapshot adapted from an original article by Devin Powell.