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1. Oil shale is a compact rock containing organic matter that yields petroleum when destructively distilled.

2. The soil's organic matter content now meets European Union standards, she said.

3. Technicians were called in to unearth the problem, and that was the first time she heard about organic matter in the soil.

4. One is a massive effort to help farmers and herders build up organic matter in soils.

5. In the process, the bacteria consume organic matter in the biomass material.

6. Black soil gradually accumulates over hundreds of years as a result of slowly decaying organic matter.

7. But the centuries the ship spent buried in a thick layer of organic matter is what actually preserved it.