Soil carbon breaks down at very different rates across the US ^{CEFR A1}

Difficult words

• soil — the top layer of earth where plants grow

  soils
• decompose — to break into smaller parts
• carbon — a chemical element found in living things
• climate — the usual weather of a place
• sample — a small part taken to study

  samples
• fungus — a small organism like a mushroom

  Fungi

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