Gap Fill - Water Purification - Level 6

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   area      earth      essential      filtration      job      layers      life      part      previously      scavengers   

Paragraph 1

Scientists have unearthed a unknown species of microbes in the beneath us. Researchers at Michigan State University have been exploring an just below and above the Earth's surface called the Critical Zone. This zone is to providing the conditions that sustain . The researchers called the microbes CSP1-3. The microorganisms could be a key of the process of purifying our water. Microbiologist James Tiedje said that while of soil are responsible for much of the of rainwater, CSP1-3 are also indispensable. He said: "CSP1-3 are the cleaning up what got through the surface layer of soil." They have a to do to purify our drinking water.

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