Think about this, decomposing leaves create heat that warms the soil; the warm soil in turn affects the growth, the conditions of organisms there.
想想看：叶子在腐烂时会产生热量，使土壤升温；反之，温暖的土壤又影响了微生物的生存条件。
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Hess suggested that the presence of water, probably released from minerals decomposing in the Earth's mantle, might have meant that a high-magnesium magma could have existed at a lower temperature.